Canvasback - By S. Calhoun Smith This kayak is the answer for young people who want to build an in expensive boat for summer fun. We turned out several Canvasbacks at exactly $21.81 apiece and each took only a week of spare time. A shop full of power tools isn't necessary, either. Ours consisted of a power jig saw and a quarter inch electric hand drill. But all the work an be done with ordinary hand tools and a few C clamps. Canvasback will carry one adult but it's handiest when paddled by a youngster. The boat stable in the water and, even through it can be turned over, it won't sink. It's also light enough to be carried with ease Building is so simple that the "jig" consists of only two blocks and a few bricks.