101 Trackplans for Model Railroads by Linn Westcott has one heck of a 1 x 16 switching layout you could adapt. It could take you all evening to run from one end to the other. Google it-you’ll find sellers. There is a section on small track plans. John Allen’s famous Gorre and Daphetid started with a 15" radius curve tabletop layout later incorporated into the celebrated monster.