This is a modern ‘sit-on’ type kayak where the cockpits are essentially open and sealed from the remainder of the kayak. The areas around the cockpits are used for both storage and buoyancy.
Construction uses 3 or 4mm plywood throughout and the stitch and tape process for the hull. The marked tumblehome in the topsides gives maximum stability for the crew and allows water coming over the deck to shed easily.
The drawings give the position for an alternative single cockpit version and for a simple rudder system.