If I knew you were interested in sea kayaks I would have talked with you about this sooner. Here's what I designed for myself last month. I made this boat as close as possible to a Guillemot "Night Heron" (the stitch and glue version) but with a more open cockpit because I like them better in this tropical climate. It's a simple 7-panel design with a shallow vee bottom and a flat top:
Yours looks like a John Winters / QCC design. I did one of those (QCC 600 I think) before this one and it has more interior volume. I designed this as a day kayak so I gave no consideration to interior volume, but it probably has plenty for short camping trips, especially for anyone who comes from a backpacking background.
The panels are all fully developed so it should be as easy to build as any other stitch-and-glue kayak. I'm figuring 4mm for everything except the coaming, and two layers of 3mm there because it bends really easily compared with the much stiffer 4mm.
I looked at that design again and now I remember why I stopped. I want trying to improve the hull lines to minimize turbulence and got stuck on a couple lower hull panels. Had to pretty much start from the beginning to get them to shape the way I wanted.
