Today I mounted the masonite sheets that make up the backdrop. Now things are really starting to look like "a layout to be".
The foundation for the U-shaped fixed part of the layout is now more or less done. The next step will either be to mount shelves above the layout, attach lighting to the underside of those shelves and install the valence, or to construct the liftout section spanning the door way.
I will probably do the liftout first. It need to be in place when I figure out how the fascia and valence is to meet and still leave space for the tracks going to and from the liftout.