NWP is a very low-drag touring kayak intended for paddlers weighing 150-200 pounds. Built from 4 mm plywood, in a garage, you can build two for the price of one kit! Heavier? try NWP XL.
The Eureka is a pretty, simple to build plywood canoe built in stitch and glue, (44lbs down to 34) and paddles nicely. Very comprehensive plans - a boatbuilding course in a book.
A serious extended expedition touring kayak, double or triple, designed to carry a large load safely and with ample stability.
The Chaa Creek Expedition serves well for long distance tripping with heavy loads.
Light and fast, a 20' tortured plywood, decked dayboat: both a double kayak and a single scull in one hull. Her 'midship' section is similar to Aleut kayaks.
