John,
Very cool. I love the work you did with the rocks/mountain. Reminds me of my three-room table layout. It took me a few years to figure out how to build around the existing stuff without interfering with their functions. It's a never ending project. It looks like you left just enough space (in most places) to get under there for backdrop installation. Otherwise, as Mark suggested, you may need one of those topside creepers.
Looks great, and a really interesting track plan. Keep us posted....
Jerry
