Pt boat plans for the famous pt 109 offered in 1:32, 1:24 and 1:16 scale – buy and download a relatively easy-to-build semi scale blueprint of an elco 80-footer.. Learn how to build a plywood boat. a brilliant idea. you can make a great plywood boat out of one sheet of wood.. About. this is a resource site by jeff davidson for the building details of an elco 80′ world war ii motor torpedo boat (mtb) / patrol torpedo (pt) boat with leanings.