Spira international wooden boat plans. following are the stock plans available for the various types of boats, separated into the different categories.. 12ft length overall by 4ft beam, by 400lbs displacement, designed for stitch and glue construction using 1/4in or 3/8in 4ft by 8ft plywood if you build this boat. My boats and boatbuilding related content navigation page. good info on ropes, knots and mastmaking. expanded articles on characteristics of carbon fiber and kevlar..