Change body meshes of players or bots?

[Toasticuss]

In the full invasion mod there are some meshes of the Hobblyns where the original body mesh was grown in size and given to a new troop to walk in preserving the original man_body mesh. How the heck could you do this? I could do so many awesome things if I knew how to link the new mesh to a faction / troop, can a player use a custom mesh?

I did a search about body meshes but nothing turned up about making a new one...

I would very much appreciate if someone could fill me in on how to link up new body meshes to troops....