I think its a big step up to go around the walls.
I have a 3 foot wide door going into my attic I had to bridge. I used the Lance Mindheim "keep it simple" method of a lift out. Stiff plywood, and metal stiffener rods below, one on each side. Adjacent benchwork has a 1 x 2 frame notch for it to sit in, so it really must be 3 feet, 2.5 inches.
For electrical, instead of banana plugs or whatnot, I put some aluminum strips on the frame and on the bottom of the bridge plywood, aligned, obviously. When it lifts down in place, electrical contact is automatic.
I would consider a low ridge or structures on the 2 foot wide side of the layout to hide staging as before, leaving all 4 walls open for some switching fun! Or, scenic the small yard as a real yard and have it do double duty of a small classification yard and visible staging.
Looks like its gonna be great!