Fixed the majority of missing tris.. there are very rarely one or two still missing, so I think there's another triangle command eluding me somewhere. I can count 6 tris missing in the overworld area:
http://img110.imageshack.us/img110/2...board02yc8.jpg
http://img160.imageshack.us/img160/1...board03zn7.jpg
... when previously, the whole level aside from Grunty's Lair entrance was missing.