Don't do anything to the sheer, boat has nice lines. Find another design with a rounded transition hull to deck rather than the hard sheer joint of an Endeavor. IMHO it would require more modification than it's worth. Can't be easy to raise the height at the sheer where you would need it without wrecking the lines or performance of the boat, there's already enough height at the center line. I'm 6-04 and have size 13 feet and paddle an Endeavor. I can wear booties and mukluks but no hard soled shoes or rubber boots.

What you can do that I think improves the boat dramatically is build a recessed cockpit. Use Nick's book for guidance.

: I'm building a basswood and walnut Endeavor kayak and I have a question about
: what would be the best way to add toe room. I need about an inch or two of
: extra deck height in the foot region. What is the best way to do this?
: Should I raise the height of the sheer clamp all the way around by 1 1/2
: inches? Should I just put more curvature in the deck? It already curves
: upward dramatically. Should I make a sheer clamp that doesn't make a
: straight line across the boat and have it curve upward at those stations
: where my feet go? Thank you for any ideas you may have.