Modifying field graphics, trees into stumps, and the like, is illegal. Bodyconv.def is not illegal. That's simply telling the game to show a monster as something else, no different than having UOA show your character as something else.
Actually, you've hit upon a good idea for players. Though not many have the proficiency to make the edit, and it can easily affect being able to get the next patch, it's pretty good. Don't you feel better about being helpful instead of calling me names?
And clearly someone thought I was talking about something I wasn't:
Too bad it's too big for a sig.