UDK 
Static meshes, LODs, blocking volumes, light importance volumes, multiple UV sets, tiling, procedural materials, Kismet etc. Then you hit Unreal scripting. Which platform are you targeting?
I won't be targeting any platform other than my own pc. I plan on testing with a couple of my friends using LAN. I probably won't be doing any LOD's and I don't know what blocking volumes or light importance volumes are, at least not yet. This is just a project to learn udk but if it starts turning out well, maybe I'll reconsider and going further with it.
Most likely I won't have to worry about any scripting as my friends are IT professionals. I'll be doing all the cosmetic stuff and they'll be doing all the behind the scenes stuff if any is needed.
If I have to do LOD's, it shouldn't be too much since the view distance will be limited by the shape of the space station.
One thing I'm totally unsure of is the UV sets as I've never really gotten a good grasps on what all to include in each uv set/texture and how big.
Well, time to go watch some more udk tutorials.
Don't be satisfied with what you can do but rather strive to do the things you can't do!
Exceed Expectations!