Ok, so I worked up a simple over/under layout in RTS for my buddy and his son to build for their trainset. It shouldn't be too difficult for them. It's 3x4 with nothing less than half tracks, 11" curves, a couple of switches to make an industrial or small storage siding and truss bridge for scenery. I figure we can do a small mountain or something and put in a couple of tunnel portals as well. Pretty basic but it should give them an idea of whether or not they want to do something larger down the road. Opinions welcome.