If you think of it purely as a diorama as suggested in one of the route building threads earlier in the year then there might be demand for it.
For instance have the loco on the far side of the turntable to start an activity then just drive across it. There would also be other loco's on the lines radiating off the turntable, perfect screenshot material!
Tried to knock one up on the SVR mainline but it fell through when I couldn't find a turntable. Might have a go again at it, or even if time permits a small route on one tile with loads of shed type buildings, a works, water tanks, coal staithes and a roundhouse, or two
Dan