How about making the timesaver or something similar for switching with one end leading to a set of return loop modules on one end. Allows for running a train, especially with sound to get the full effect. I have a MMI On3 K-27 with sound, and this is what I plan to do. No room for a large layout. I already have built two 2' x 6' modules using 1x3 framing with 1x2 cross members layed on their side and 2" blue foam board inside. Makes for strong but very light modules.
Mike