Body type 2 seem to be the largest hurdle but if creating an all new race you'd have at least that much work to begin with...
As for implementation issues... some of these already use playable race rigging therefore armor adjustments are mute:
Jinyu use the male Night Elf rigging, Saberon use the male Worgen rigging
Furbolg and Gnolls were were just reworked in DF