I attempted to fit the 115ft turntable and roundhouse in but it would have meant redoing the entire left hand side of the yard as well as getting rid of just about everything else inside the wye. Just couldn't give up on Ben's locomotive houses either.
I'll tuck the turntable version away on a cdp for future thought.
Thanks for the advice guys, great screenies as always Dave. (Love me some good streamliners!)