I really like this design!
On30/O 3R designs are an interest of mine. My own layout--though much more compact--makes use of similar elements. I wish I had the room for something more like this one, for the routes are much more interesting than mine.
I am eager to see this design translated into reality. I would use Atlas O or Grargraves/Ross instead of FT because I prefer their look, but that's in NO way a criticism of the design.