I have a shooting range that when you stand in the range, raider after raider will be spawned for you to shoot at. Loads of fun, especially with the rocket launcher that needs no ammo! LOL! I only have one of the 4 shooting cubes done. I may do a robot and a super mutant range as well as a talon company mercenary. Heh Heh.
The holographic pod terminal allows you to change between the 'Home Town Invasion' program and the 'Ruined Police Station' program. I may think of some more and add them later. I was thinking about a beach or something just for relaxing at.
I really liked the gun cabinet in the game, so I retextured it for the overseers office as well as the holographics houses.
http://i97.photobucket.com/albums/l237/WillieSea/ExpV64044.jpg
I have also been working on cluttering up a few areas and putting in some story line for the three people who were in the vault.
I also had a lot of fun making 'e-mails' for the senators computers. I think they are funny! (if not conspiracy theory true)
The shooting range sounds awesome, perhaps you could rig it to have a terminal right there so you can select different spawns or multiple amounts of them. Will they be worth XP or will there be a no xp option?
The programs also sound pretty cool, perhaps after you have finished vault 64 you could come up with an addition to it(since it would probable take forever) to make a holo area filled with multiple different programs, like a library filled with skill books and the like, a bar ( with holo companions ) or even an armory (kind of like in the matrix),or an arena for melee stuff, you could do multiple themes and setups, there are many options at your disposal.
I think the gun cases look pretty nice too.