I have to say that the addition of the out-of-map area around the map is great; many CE maps lack that extra atmosphere, and I always liked the extra details Bungie threw into their Halo 3 maps in the forms of unreachable areas.

Portals are still quite screwy, and I know there isn't much you can do about it, especially right now, since you'll be adding and subtracting from the map as time goes on. The tops of the bases have a tendency to flicker in and out of existence as you walk around.

You're missing the buildings that should go right next to the hog cages across from both bases.

For your next test build, please use a sky that illuminates everything (no shadows)? I can't see a lot of things very well and I get disoriented easily trying to figure out how things look.