Our railroad museum in Sioux City, IA has a Dunham designed and built HO layout about 15' x 75'. It was built in 91 for a businessman in Omaha, NE. We obtained the layout in about 2004 and had it stored until 2010 when we finished a separate building. It is well build and runs daily. see www.milwaukeerailroadshops.com.
Dick