WARNING: THIS IS A ZOMBIE THREAD…
But it’s purpose is more of a continuation.
So, almost six months on, and I’ve done a lot of new drawings and figuring. I had thought I was done, but then I realized I’d gotten some very good advice and just become boresighted and pigheaded about my designs.
In light of the previously mentioned breaker box problem, which another electrician familiar with codes emphatically said NOT to block with an upper deck, removable or not, I’ve decided to focus on making this layout single-deck. However, I’m going to build it such that I could add a helix to a second deck later, which would operate as a turn job, coming near but not crossing the breaker box.
So this is where it stands now.

I pushed the engine yard back into what used to be a reversing loop. Instead of the loops I had in previous designs, I now have an around-the-room design with optional continuous running facilitated by a removable bridge that runs to a repositioned, removable staging yard. The train would run from the staging yard, past the engine facility and station, through town, and then turn at the gravel quarry, returning to staging tender-first, unless I decide to just run trains, in which case it will go through the tunnel back to the staging yard, and do it all again. I’ve decided my power will be Moguls, with perhaps a Ten-Wheeler or Connie for variety.
If I do eventually add an upper deck, I’d move the quarry, and have the switch lead to the helix instead. The process would be more complex than I describe, but that plan is still very nebulous.
This design will allow for plenty of switching, which I love, as