A long time ago I said I'd make a request for a house on the moon. The thread for that's here. I could try combining the ideas: Your ideas for the inside of the house with the other thread's method of entry (Getting catapulted into space). I'm not sure if I want it to actually be on the moon, though. Maybe an asteroid or other satellite.
Well, since I'm now feeling guilty about the other project, I'll see if I can do any of this. I can, at the very least, model most of the stuff and do the basic interior. THe more complex scripting might elude me, like a practice arena, the obstacle course, or getting the moons to rotate about the house.
Edit: A revelation! How about a small floating rock above the surface of one of the moons, so Nirn and Masser could be seen in the sky and Secunda's surface could be used for the larger parts of the house, like the training facility.