Jan, if you look at my first post, the bench work there matches the drawing I was given. I've taken some liberty in the latest rendition to change the bench work in the lower right corner, but I haven't asked Bob if that's going to be okay and I don't thing he's noticed it yet. 
(moved/expanded) to use less bench work and free up some space for the aisles. I haven't taken the time to measure things like edge clearances, etc. I've been so focused on getting the TT/RH close to accurate in size so I could play with placement, that I haven't played with changing the benchwork as yet.
That said, I believe the upper level tracks and the lower level ovals can be expanded a bit. This would allow the benchwork to shrink some and add to the size of the aisles. I think Bob is mostly concerned with keeping the aisles at least as large as they are now, but I don't know if he has plans for scenery that would preclude shrinking the bench work.
However, I'm not sure that will provide enough space to use the Korber RH or the 34" TT. My next post will offer more insight to the TT/RH situation.
