Alright, so I've been having a lot of problems with changing my Tauren to an Orc, mainly with the beard. After a lot of digging I managed to fix this (at a price, of course).
Instead of having the fluffy santa beard with tauren textures, the orc simply has to have no beard and no hair. Doesn't bother me much since I have a helm anyway. Also, the model size is the same as a tauren, along with running speed. I'll work on fixing those later.
Enjoy.
patch-7.mpq - Tauren to Orc - BADONGO