OK.
Feel free to rip apart areas too, if the scale and door textures don't suit you.
EDIT: Okay, got some areas finished.
These are connected by a tunnel, and I have another tunnel in the RMF that won't be enterable in the BSP.
I think I'll make sections of tunnel with stations and stuff in them, but not connect them so you can have your say where they all go.
No NPCs though, I don't know what you want in there, or what models you're using.