Hi Pedro,

I have also thought about building a surf kayak. Strip built would be my preference. I have been following the design and build of a surf kayak at the following site. http://www.blueheronkayaks.com/kayak/index.html.
Go into the forums and scroll down until you come to surf kayak in both the kayak foundry and the build forums. He is fiberglassing over a plug but the design is one I have been fooling around with. Jim