So, since I don't know how many readers there actually are out there, here is a brief update. Basement progress is coming along slowly. Summer weather = time outside, not in the basement.
In the mean time, I have spent a fair amount of time trying to figure out how to build a layout that works like the prototype, doesn't elimate the use of this room, and actually build to an operational state.
4x8 is off the table, no pun intended. 18" shelf on a long wall, 12" shelf on a short wall, with a 4" shelf to get trains all around the room. That is my current idea. I can't pull myself away from the option of continuous running, otherwise a point-to-point switching could be done with 12" on both walls or even less.
About ready to set up a few turnouts on a table-top... just to do a different kind of "yard work"!