Bodypart versions? Is that a SP thing, so all the npc's dont look the same? Afaik, there's nothing like that in tf2.

One of the servers that I play on had a plugin running over the holidays, where every player had a party hat model attached to their head, so carrying models must be possible. I'm just too busy moaning to go and find out how. However it's done, I doubt that it will be as easy to as using the old item_tfgoal.