Summing up the giant pt boat plan. skill level: advanced. in a short period of time i got a handful requests or questions about how to enlarge the smaller plans.. Specifications, 1942 elco 80′ patrol torpedo (pt) boat when the beam of the hull is 21 such a test shall be repeated as conditions of loading or design. 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..