A scratch built rc boat hull easy and inexpensive. learn to scratch build with this simple project. plans are available for download.. Here you will find custom built rc gas boats, rc boat hulls, rc boat kits, rc boat motors and much more. do you want to blister the competition?. The lauterbach thunderboat is a 1/5 scale replica of the world famous hydroplanes built by henry and larry lauterbach from the 1950’s to the 1990’s..