I agree with Eric. I recommend the Great Auk as one of my designs for "Big Guys". It is relatively roomy. Try making a mock up before doing anything dramatic.

: Nick and I each built the predisessor to the great Auk as our first kayaks.
: It is a fun boat and fairly roomy. I would not think you would need more
: leg room unless you are extra tall or big or have limited mobility. If you
: think you need more space I suggest you mock-up the cockpit with cardboard
: forms at your knees and feet and a cockpit cutout at the correct hight.

: If you are planning on lowering the deck, again do a mock-up for fit, also
: draw it to scale on a copy of the plans to see how it will look. also look
: to see that the new deck forms will be fair so that the strips lie
: smoothly. you certainly can make any alterations you want but be careful.

: --eric