I put together all of the different files and settings that I use for my guys. I hope this helps some people that have struggled finding all the pieces.
There are 3 sets of arms, 10 leg poses, belt accessories, a few weapon choices, torso, helmet, powerpack, and blank shoulders.

The parts i used:
Head: Primary Builder
Arms: Primary Builder
Bolt Rifle: Primary Builder
Legs : https://www.thingiverse.com/thing:3995722 by feanor007
Belt: https://cults3d.com/en/3d-model/game/space-warrior-belt-accessories by mrmcangry
Chest: https://www.thingiverse.com/thing:4000743 by Ezza
Powerpack: https://cults3d.com/en/3d-model/game/prime-space-warrior-backpack by mrmcangry
Shoulder: https://cults3d.com/en/3d-model/game/blank-primaris-shoulder-pad-with-shield by krackendoorstudios
Chainsword: https://www.thingiverse.com/thing:4127629 by mrmcangry
grimdark charms: https://www.thingiverse.com/thing:4205681 by Danny_Cyanide

Print in pieces and pose and build. Hopefully everything should be appropriately sized now.