[Anvart]

Technically it is possible, I think, without major problems... but the monotony of crew bodies will remain, because the game engine handles only two bodies body01 and body2 (for body2 engine is more tolerant... see my mod AI_Crew.rar for NYGM). I think, for the sake of simplicity, the first test should be done for AAGun crew, see my mod AI_Crew.rar.
Need to create (or edit, and use existing) body, head, helmet, binocular, and so on.
Need to create skeletal animations, eg for 20mmTwin_UFlak gunner, then get the keyFrames from them (vertices animations) and so on... and check out how the engine operates in principle with created model (for begin in AI mode, as in AI_Crew.rar mod).
The question of new crew models has already been discussed some times and everything is already said.
This is laborious and long process. I think that little modders willing to lose the part of their life on doing.
The references of the amateur animations of the standard body, that been made at one time, are not proper.
The initiative is punishable - therefore fish, as the initiator, will do this work. lol

Regards, Alex.