Hopefully it helps someone down the road!
I got this pack back on Jan. 12th '22 as a gift from a close friend. It's a Q-Pack MK3 3D print with ABS(?) I believe. May be PLA - I'll get the correct info on it later to confirm.
Spent the month sanding, priming and painting this thing and had it mostly finished by Feb. 24th. I got the thrower parts in by late March and had the entire set mostly finished by April 18th. Of course around this time since, electronics have become hard to source and money has been super tight. I don't mind waiting though. I'm patient despite knocking out this pack in a very short total work time. At this point I'm still waiting on a V-Hook from Ben-of-Wait-Times-Are-Incredibly-Insane that I had ordered in early April. (oops) and saving up to either piece together my electronics or get a kit from NinjaTunes.
I also made some modifications to this pack. Nothing too crazy so at first glance its still recognizable but the more you look the more you'll find. I'll leave those for the eagle eyes to find and not elaborate too much here.
I am still sorting out photos from this build so bear with me. I'll try to post everything in order and may add photos as I sift through them.