This is probably not the place to ask, but i am going to do it anyway. I'm not a programmer, nor understand anything about programming, this is just a thought i had.
I have seen games that use a modular body parts system to have random, or customizable characters ('The Company' did something similar to it).
How hard would it be to add, or mod-in, a modular system for body parts?
The prequel to this game had the randomportraits mod, which would somehow pick different pictures for different characters using tags (honestly i'm not quite sure how it worked).
I'm picturing a more advanced version of that. Working like, there would be folder containing PNGs of differently sized bodyparts, and this theoretical mod would put them together as the character's body picture in game.