I think the empty space is the perfect canvas for my artistic energies so I'm going to attempt to build a town or two using the GECK sometime in the near future. If it works out, I'll see about releasing it as a mod (Or modders resource because I don't know if I can make the town 'work').
If I had a PC, I'd be at the computer days at a time, learning the GECK. Fallout NV is perfect for a dreamer, it uses so many skins and textures from Fallout 3 that I love PLUS a MASSIVE haul of pre-war style skins and textures, and for someone like me who would love to miniscale a 'pre-war' world, an airport, maybe a casino, and a clean unruined street, heck, it'd be beautiful.
@Devil- Do you mean the blown up bunker between Nelson and Forlorn Hope? If so, that's odd. I have NEVER seen it be locked before.