This site has plans and instructions for lots of ocean kayaks in both
strip and plywood. There is an extensive online instruction section
with photos but you have to buy the plans to get the plans for molds.

http://oneoceankayaks.com/index.htm

They are really pretty kayaks and seem pretty tough. This site has
helped me in planning my canoe build. The description here is better
than what I got with my plans from the designer of the canoe.

Bill