Ironside,
The layout was secured to the walls with simple 2 1/2" drywall screws. I built the frame of the layout out of 1 x 4's, and screwed another 1 x 4 ledger to the 3 walls to support the layout. I think I set the layout at a kid-friendly 24" high, to allow my nieces to reach the back side of the layout (I built 2 pop-out sections to allow them to access the back areas).
Geno