Well, speaking of turntables, Carl's Micro Layout site did a spot on a 7 1/2" gauge railway that had a turntable with a switch on it.

Don't think that hasn't given me much food for thought.

They also has sliding tracks inside the engine shed that could be moved back & forth to accommodate 3 locos in a space that that you'd think only 1 was possible.

That too has given much food for thought. This little railway is in England, at Bekonscot, Buckinghamshire. That railway is on page 67, November 2007, N.E.C. (Not Elsewhere Classified) of Carl's site.
Carls' site is always worth a visit. G is shown quite a few times on small layouts. His site is also very inspirational. This month's issue has a short article of someone who builds Christmas layouts from Dollar Store trains. Fascinating.
