Some time ago, a couple of us were fiddling with Halo, and I was able to get my hands on a single custom level in max format.. it is essentially a basin with some terrain and could appear as if you are flying into a large shallow valley with a base in the centerish, similar to Planet Sprague (no down the mine shaft tho..
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) Perhaps a joint effort could be mounted to do this .. I know doing the planetscape is no biggy but this model may be suitable and I have a texture that it may be possible to use and add to.. plus I have some info on the placement of base hardpoints.. and I am glad to help if I can...
Harrier