I wish to post this LAYOUT DESIGN here. What you see here is the 3D illustration using RR-Track. The main bulk of the subway related details remain in the Subway Forum, so please go there for subway details. I am using Atlas track for the entire layout, but the switches can be kind of flaky. My benchwork is in modules mostly constructed using 1/2-inch plywood supported by 1x4s and using 2x4s for legs. Upper level has varying degrees of wood either 1/4- or 1/2-inch-thick oak, Sandee, birch, or standard plywood. Need to keep it light because some modules will be raised on hinges. but use 1x2 pine cross sections to prevent sagging.
