Useful Resources These links take you to articles, pictures, people, and other resources that might be useful in the boat-building process. Boating Terms – A visual introduction to sailing terminology. Making a Simple Polytarp Sail – Scroll down on this page for instructions. Sail-Shaping – How to shape your polytarp sails for maximum efficiency. Making a Light-weight Box Mast – Mostly visual instructions for a lightweight mast. The Hot Tub – My Version of Payson’s Skimmer made from Styrofoam or lauan. Amateur Boatbuilder’s Page Lots of information on materials. Boat-ed.com Link for US Coast Guard and State Approved Boating Licenses and Safety Courses Glen-L Designs Order their catalog. They have been in the home boat building business over 60 years. Boat-Building in Plywood Sail Area Math A Jim Michalak essay.