I don't know how to do it exactly, but you might want to consider the fact that multi tiled mobs happen to fall apart while playing the game... I remember a game called Deus Es Non (or something of the sort) and it had multi tiled mobs... Whenever I moved my head came apart like a jigsaw puzzle... pretty nasty stuff for laggy games... Also ya know... A prescription of ritalin would do lots for you... -_-
-Raven-