Emma--
If you want to go the stitch & glue route, Pygmy's Osprey Standard meets at least a few of your criteria. It's length (less than 16') is deceptive, as it holds as much as many much longer boats, due to virtually no rocker and a wide 24" beam. The minimal rocker means it tracks like an arrow, but the wide beam (relative to many 22" boats) makes it a little slow. If you build it with bulkheads and hatches, you get very easy storage access, as Pygmy's hatches are BIG. Happy building, happy paddling.
Bob
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: I'm looking for advice on kayak design. I'm 5'4" and about 130lbs and
: want a boat that has enough load capacity for trips of a week or more. I
: would prefer something with low-effort speed and tracking over
: maneuverability, and that will be comfortable in good-sized waves. I have
: been thinking about either the Great Auk or the Endeavour. Any advice
: would be much appreciated. Thanks.