Is that right? According to the Custom Content Guide on custom races, "You do not need new textures for each armor part because all of the armor pieces use the human, standard phenotype PLTs."
I'm certain that's right for armour - is there a difference with body parts?
Yes, that's correct. However, I seem to recall reading somewhere that, as Jedijax stated, the internal bitmap references for *custom* races need to match the model name. If I remember correctly, that post stated that, except for heads, the engine reads pmh0 and pfh0 as the texture prefix. BUT, if its a *custom* race model and the bitmap reference is NOT the same as the model (mdl) name, the engine defaults to non-existing bitmaps for the body parts - hand, foot, chest, etc.
NOTE: According to my nephew - he's a 3D game artist, these bitmaps actually do exist, but you need an older copy of 3dsMax AND some really expensive character model creation plugins to see them.