The construction is done with a technique called “stitch-and-glue” and is built from thin plywood. The stitch-and-glue (S&G) method use plywood panels cut to shape that are temporarily wired together with copper wire. This wire is the “stitches”. With the panels held in their intended shape with the wire the plywood is permanently glued together. The wires are removed and the whole thing is covered in a layer of fiberglass cloth and the cloth is saturated with epoxy resin to make it strong and waterproof.
The preferred material for this construction is 4 mm thick okoume marine plywood, covered with a 6-ounce per square yard fiberglass cloth coated with an epoxy resin. This will provide the strongest, longest lasting construction, but if you are strapped for cash, you can substitute lauan “door-skin” for the okoume and polyester resin for the epoxy. Lauan is apt to have gaps in the interior veneers that make the plywood. These gaps can weaken the material and may accumulate condensation leading to rot, but with a little care in building and storage when you are done lauan can make a nice boat. The description of techniques in these instruction assume epoxy resin, you may need to adjust your technique if you opt to use polyester.