I worked up a sketch of this idea, but unfortunately photopoint.com won't let me link to it anymore, so you'll have to use your imagination on this one:

1) Imagine that you've installed a flat foredeck from the bow to about the front bulkhead, and a flat deck aft of the cockpit.

2) Now imagine sitting in the kayak, holding a piece of plywood for the deck above your legs. You're bending it CLC-like, with one edge of the plywood at either shear, forming a cylindrical shape.

3) Now imagine that that bent deck is intersecting the flat foredeck. It intersects it in a parabola. Cut the bent deck and the flat foredeck with this parabola shape and stitch them together. Attach the sides of the bent deck with shear clamps.

I'll post a picture if someone can recommend a good free site for image hosting.

Getting the deck to go from flat to curved as you suggest requires a compound bending that is very tough to do. It buckles the wood a bit. Betsie Bay Kayak does this, but they have a vacuum mold that draws the plywood into shape while they attach the hull. Trying to get a compound bend without their fancy apparatus will involve much cursing. That's why I thought that making a flat section and a bent section joined at this parabolic joint would make the job easier, and would look better than the 3-panel or peaked deck.

Also do a search on this site for Bobby Curtis and his Sea Spirit. He did some custom bending/forming on that boat and has a website somewhere.

Dean