John,
Here are a couple quick thoughts while I am on break.
I am really hoping to run my H9 Consolidation which takes 042 curves. I realize expanding the curves to 042 stretches the canyon loops out into the middle of the room. However I got to thinking, I don't need to provide for continuous running on this layout. If I want to do that, I can just step through the door and run trains on the Ceiling Central RR. So, besides some sidings, buildings, and wye/turntable at each end, I don't need room for a turning loop.
Do you think this idea would work?
Marc Williams really wants to see that H9 I got from him on a trade run on this layout.
Right Marc? ;-)
Oops, gotta go for now!