I was just curious as to how large the wasteland is, in quads. I checked out the heightmap in the editor, and it is extremely large, but how much of that is within borders? I'd like to know this so I can compare my own mod in size.

Go into the editor and go to ~Rivet City and note its cell coordinates. Then do the same with Raven Rock. Then do the math. Its not exact but should give you an idea.

Great idea! Thanks!

Here, maybe this will help: http://img265.imageshack.us/img265/4295/wastelandoverviewquad.jpg

The heightmap should be 36 quads of tangible surface area (land whose data is available/existing in the Fallout3.esm). I'm fairly certain only the 16 quads within the black border are the playable game area for that worldspace, with the other 16 used as border region decoration.