A scratch built rc boat hull easy and inexpensive. learn to scratch build with this simple project. plans are available for download.. Shop from the world’s largest selection and best deals for hobby rc boat & watercraft models & kits. shop with confidence on ebay!. 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..