It's roughly 20mb.

I tried placing it inside of a big cube, and making it passable, and even invisible, and still had the same problem.

My modeler told me he wasn't done with the model, and that it has some unfinished faces. I'm not sure if that could be the root of this problem. Doesn't seem like it should be.

Maybe the model is scaled too small? I really can't think of much on this one...

EDIT:

No, I take that back. The cube really wasn't working right. It looks like it's the terrain or something. I've never seen this happen on any other level/project. It's starting to annoy me, lol.