Hey Cole! So cool you are chipping away at this still
I defiantly think the second option favouring the curves is the way to go, but I think you could even push it a bit more.
Here is a picture of Spenglers hero from front on, I think some of the curves you have laid down need a little work but I really think you are going down the right path
Here is your file overlaid as best as I could.
And here is Just a quick outline I did in illustrator on where I thought the main curve areas were, It's still missing some bevel lines but you get the idea.
1/4" radius edging seems to be the best I think. However, I don't think we need to worry about making the ribs crooked like seen in the last shot. There seems to be discrepancies between packs, and I think since we're idealizing them at a 9/16" size to begin with, let's idealize them as straight (with the exception of the long rib on top of course).
While I'm remiss to refer back to other scratch built packs, I kind of like what chris did on his crank gen with the vac line recess. It has a curved step that gradually blends into the gun mount spacer. I need to pull up pictures of shells that have lineage to see if they handle that area the same.
And not to get ahead of ourselves, I was looking at the width of the filler between the crank and the gun mount. It looks to be roughly 1", and with my wooden mockups, having the 1" in between lines up the corner plate and the gun mount properly.
Kitten, what I'm saying is; sometimes, shit happens, someone's gotta deal with it, and who ya gonna call??
Hijacker's Pneumatic Emporium