I just pulled your changes into the latest build of the game, it is neat to see the actual objects in the game environment. The texture's don't seem to be working yet, you may want to try tinkering with them on your end. That portion of the loading hasn't changed recently so if you get them to work in your copy then they should work for anyone. The sizes look good, I can make the room take a 4x4 area; right now it spreads them out over a 3x3 and it's a bit cramped. The models are also upright now so they look good from that respect. With regards to the layout, if you could rotate the forge around the z-axis by 180 degrees and rotate the anvil by 90 degrees they would look better (this is a minor change and can be uploaded to SVN later, don't forget to apply the rotation to the actual object with Ctrl+A).
Also, it would look cool to have some sort of bellows on the forge. It would be cool to animate the bellows slowly expanding and contracting. I would suggest putting them to the side of the chimney opposite the flat "workbench" portion on the side of the forge. Also, the front looks too much like a fireplace with it flat. I would try to extend the front portion out in sort of a semi-circle (although not far enough out to make it a proper semicircle (it should be wider than the amount it sticks out by).
The issue of one file per change is fine now. I wouldn't worry about it then, thanks for having a look at it though.
-Buck