User avatar
By GhostbusterPM
#409946
Some people may have already heard rumors of my 3/4 scale proton pack replica. Well I'm pleased to announce those rumors are true and here is my build thread to prove it. Unfortunately I was so focused on the project I forgot to take some photos of a few parts and steps as I was building, but the majority has been documented.
I will also show pictures of all the finished parts after they had been molded, so you will get to see all the finished parts.

If you're interested in buying one of the finished kits see my For Sale Thread.

Using a combination of Stefan Otto's plans, measurements off some screen used packs, along with various reference photos and consulting some known pack makers, I scratch built a complete 75% scale pack replicate. This includes Pack Shell, Bumper, and hardware. If its on a proton pack I've made a 75% version of it.

Here are some pictures from the build.

I constructed the buck using almost entirely 1/4" basswood. I cyclotron was made out of pine.
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The bumper was build by deconstructing it down to its basic shapes. Using basswood and thin sheets of plywood I got from the craft store, I was able to create sections of the bumper and assemble it piece by piece. Then using bondo I filled the seems and rounded the edges.

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Heres an image taken next to a full scale shell for reference of scale.
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Later I was able to find an exact 75% scale REAL bellow.
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At the hobby shop I was able to find hexagonal brass tube at the exact scale I needed for the Booster frame, as well as strips of wood that had the exact scale ridges I needed for the 2 sides.
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I created an almost perfect replica crank knob by using Apoxy Sculpt to modify a knob I already had.
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Using PVC pipe layered with card stock (to build up the diameter of the pipe) and styrene I was able to make the N-filter and Cyclotron rings.

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I secured the N-Filter with Apox Sculpt and then glued the cap on.
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Using plastic tube I got at the hobby shop I was able to construct a 75% scale Legris elbow replica.
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The pillars, Injector tubes, and PPD were made from plastic tubes, PVC and styrene.
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I made fake welds on all parts requiring weld details using a plastic syringe filled with silicone calk. Mid way through the drying process I patted the calk down giving it the necessary appearance. I used this process on the N-Filter, Pillars, Injector Tubes, Ion Arm, and HGA.
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Next I had to make 75% scale resistors for the Ion Arm. This I was able to do by using Styrene strips, tube, and Apoxy sculpt.
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Then it was time to make the Clippard.
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Next I moved on to the thrower. I started by making the body using Basewood and 1/4" Styrene which I heated and bent to get the curved top edge.
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I added the small details including the weld around where the knob on top goes.
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I think that brings me to about here.
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The thrower grips were carved out of wood.
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I made brass banjos from a brass tube and a square brass rod I found at the hobby shop.
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The heat sink I carved and assembled out of basswood strips.
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I constructed the trigger box and rear instrument panel from basswood. I designed it so that the trigger box will slip into the instrument bar and can be glues or screwed in from the bottom or back.
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The gun ears were made from basswood.
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The remaining knobs and hat lights were made with styrene, Appoxy Sculpt, and casting resin.
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I constructed V-hooks which will be one side resin and one side Aluminum.
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This is the aluminum side.
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After all this it was time to start molding. Molding so that I could start making these kits available to the Community! Thats right! One of these could be yours, or your Girl friends, or your kids! But we'll get to that later. Right now lets look at the molding process.

Heres us claying up the buck in preparation of creating the mold jacket.
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Now creating the mold jacket.
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This is my mold box for the bumper.
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And here are all the mold boxes for the remaining parts.
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Pouring molds.
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Demolding.
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Next to a full scale mold.
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And the master buck goes on the wall to hang out with some of its big brothers.
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Now its time to start glassing shells.
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First shell had a defect in the mud coat. It had been under catalyzed.
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So we try again.
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Beautiful.
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A proud new pack owner.
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Off to work I go.
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And time to start pouring parts.
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Heres a nearly complete thrower kit.
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Some rubber bands to hold it together and a full scale thrower for reference.
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Bumper pulled.
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Heres all the finished parts to the kit.

Trigger box assembly.
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Gun body.
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Hat light caps.
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Thower knobs.
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Thrower grips.
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Gun Track.
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Thrower Misc.
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Heat Sync.
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Clippards.
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Hardware.
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Booster Frame.
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Bellow.
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Ribbon cable clamp, buster plug and wire lomb tube.
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Ion Arm.
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Resistors.
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HGA.
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Injector Tubs and pillars.
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PPD.
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Bumper.
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And finally a shell
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----------------------------
Now I'll start putting one together.

This pack is being built from my first defective shell. I patched it up and it looks great!

The finished pack will be donated to a local kid who is one of the biggest Ghostbusters fans I've met and really deserves a great proton pack.

I apologize for not having a more complete account of the build, but once I get going its hard to stop and think about pictures. But if you've ever read a build thread before its essentially all the same.

I'll try to better document the build of the next kit I put together.

I've replaced the Clippard tube with wire so that I cans still match color with scale. I also am using a 40 pin ribbon cable instead of a 60 Pin. Not quite 75% scale but close enough.
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Pic for scale
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Decided to get a little fancy for this kids pack and gave it aluminum handles with a rotating barrel and a spring loaded acrylic tip. The kit is designed to fit a standard PVC pipe, so I had to modify the holes with Apoxy Scult to fit the slightly smaller 1" Aluminum piping.
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Its such a beauty. I'd never guess it was from a reject shell.
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Next to a full finished pack for scale. Still needs some more work, a mother board, and alice frame, but its well on its way.
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What did I say about alice frame. ;) I think I went a little mad trying to make this. But it was well worth the effort.
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More to come soon. I'll update it again when I get more done.

Again, if you 're interested in buying one of the finished kits, see my For Sale Thread.
Kingpin, AJ Quick liked this
User avatar
By jros3484
#409964
No bs.... This is the best build I've seen in this site. Period. There are tons of incredible ones. But none calculate, miniaturize and fabricate everything like you have. Unreal. Seriously. Unreal. Go get some ice cream and celebrate.
By Tobot
#409978
Amazing scratch building skills! Better than a lot of full scale scratch builds.

Now offer these up in 50% 75% and 100% as kits and become a rich man ;)
User avatar
By nicopelli
#409981
My god man this thread took a minutes or so to load on my phone and I'm on 4G! Over fantastic job on this build, if I had a kid I would buy one of these kits for him in a heart beat.

Sent from my ADrR6400L using Ghostbusters Fans on Android
User avatar
By Letmebleed75
#409982
One statement......
........make shells and sell them
User avatar
By techdisaster
#410112
Incredible skill, incredible quality. Thanks so much for sharing the pics of the build process.

I'm almost ready to make a mold of the helmet I made my daughter for halloween (she wants to be a Skylander), and I don't know what materials I'll need to make the mold. Could you tell me what silicon rubber you used? I was looking at SmoothOn Mold Star? Any info on the build would be awesome.

Thanks in advance!
User avatar
By GhostbusterPM
#410126
Could you tell me what silicon rubber you used?
I live in Los Angeles, so special effects suppliers are in abundance here. The place I got mine is the FX department of a place called Nigel Beauty Supply. Here's a picture of the label of the silicone I used.

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User avatar
By GhostbusterPM
#410127
Thanks to everyone for the great compliments! If you know anyone who's looking for a pack for their lady buster or little buster please feel free to direct them to my post. I'd love to see more than just a handful of people with this pack considering the time and effort I put into it.
User avatar
By Wallabe
#410130
This build is absolutely amazing.

I especially loved the elbows. Any chance you could make a tutorial for scratch building them for the sake of making 1:1 replicas?
User avatar
By GhostbusterPM
#410196
This build is absolutely amazing.

I especially loved the elbows. Any chance you could make a tutorial for scratch building them for the sake of making 1:1 replicas?
Building the elbows was actually rather easy. The hardest part is finding plastic tube the right size. It also requires a heat gun.

I'll try and put together a tutorial in the future, but the gist of it is I took a piece of plastic tube in the proper diameter and cut the top and bottom to length. Then I sanded the slight diagonal edge where the 2 pieces meat. Then using a piece of acrylic rod, that fit in the tube, I heated it with a heat gun and bent it to 90 degrees. Then I slid the 2 pieces into place and glues it together. Then I found a brass nut at the hardware store and placed it on a threaded rod and glued it to the bottom. All that was left was taking a piece of brass tube and glue it in the top. Hope that makes sense.

When I have some time I'll try and construct another one and document the process.

The key to making anything on this build was to break the part down into its basic shapes. This ones shapes were easy because it was mostly round with straight edges and easy angles.
User avatar
By Letmebleed75
#411041
Thanks to everyone for the great compliments! If you know anyone who's looking for a pack for their lady buster or little buster please feel free to direct them to my post. I'd love to see more than just a handful of people with this pack considering the time and effort I put into it.
Trust me boss. If it wasn't for the fact in having a child in 3 weeks I'd already bought two. I'm just praying I get the chance to get 2 from ya sometime
User avatar
By GhostbusterPM
#411236
Did some work on the thrower today. I placed a yellow acrylic lens in the light graph, added switches, and decals, and placed the light caps in place.

I used a blade to score notches into the yellow lens. Then I spray painted the lens black. When the paint dried I took some steel wool and sanded the paint off, leaving just the very thin lines where I had scored the acrylic in black.

The decals, like the clippard label I printed on printable foil label paper which I got here. Labels that were not printed on foil paper were printed on glossy label paper that I got from the same site as the foil labels.

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AJ Quick liked this
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