You can build the canoe seat we have designed for our Moccasin 14 Canoe for your boat too. All you need is some scrap 4mm and 6mm plywood, epoxy and cabosil thickener for fillets. Print out our 1:1 templates at "actual size" on your printer, double check them for scale, cut out the parts and assemble!
The seat is 4mm plywood and wedges pull the top down to the beams forcing it into a comfortable "tractor" seat shape.
Overall length fore and aft: 16 15/16" (430mm)
Overall height: 11 7/16" (290mm)
Overall width: 17 5/16" (440mm)