An instructional video on how to build a sturdy, affordable, wooden sailboat mast.. If the mast of your sailboat passes through your cabin top, you need a good seal with a mast boot to prevent water from entering the cabin. you can buy an expensive one or make your own from inexpensive materials. follow these simple steps.. How to make a sail. in this article: getting started designing the sail assembling the sail community q&a 18 references. know the boom and mast dimensions. measure the boat you intend to use the sale for in order to calculate the appropriate size of your sail. if you have a short boom and a tall mast then that is a high aspect.. Laurie's-projects: driftwood sailboat tutorial 10 new bargain sailboats: best value buys - boats.com