Welcome to the .Org, Mad_Max!

I'm not much of a modder, I just tweak existing stuff, so I won't be much help with modeling issues. Hopefully one of the more technically minded shows up to answer your question.

On the subject of dead bodies, even in the vanilla game some bodies do not appear. There is a bug in the deadpage coords file and the engine stops parsing the file when it hits it, resulting in about 1/4 of the units not producing bodies. Stazi has one for another mod that supposedly works for vanilla, the thread discussion for that is here.