Thanks for that information Donald! Rick is still considering some of these issues.
Assuming the turntable is configurable, I looked at a spacing of 7.5 degrees on the 30" turntable to see what that might look like. Larger set-backs so that locos don't rub elbows of course, but more whiskers, and a big saving in footprint. Ties may need to be trimmed, but the rails don't come close to overlapping. I am careful about intruding into people space - if you look around the layout, there are plenty of places where the aisle space is just 36", and not much larger spaces for folks to congregate. Rick and operators need to feel comfortable and enjoy moving around the area, and not feel "boxed-in" to a confined space, which can detract from enjoyment. My opinion in the design. Anyway, here is what something along these lines could look like:
