jhz563 - That section of the layout mates up with a long straight run on existing shelving that is built into the walls and I had to build this section a total of 1.75" thick in order to mate up properly. How it all comes together through closets and from another section of the layout is complicated and more than I need to get into here, but trust me, it cannot be changed.
I agree that routing it out will be messy, but it is viable and I plan on adding some additional bracing once installed.
Dr. Jack - I considered using the Ross TT but had to reject it because, since my TT has to be mounted into the decreasing radius "throat" area of a reversing loop, I did not have the width necessary to mount the Ross TT. I only have about 30" width and the 24" Millhouse River TT fits nicely into that dimension.