The thing is (damn, why can't we edit posts...), that if you knew anything about retro porting (and more than nearly nothing about WoW modding in general), you wouldn't even ask this question, as you would already know the answer. Which makes your question nearly unanswerable, apart from saying "yes, its possible, now learn as much as you can about models in WoW and you will get to know how to do this anyway".