It depends on your desired fit.

I built a Guillemot and stretched it to 18' long. It's still 21" beam, but I added an inch of height near the cockpit area. I like the length, regret the height. Love the 21" beam and the way the boat feels under me.

Shawn
6'-6" tall, 185 lbs, size 14's. Tight to one is roomy to another.

: Don't ask me about paddles, I have issues with making those (I have a half
: finished paddle that someday I will complete )

: As for Guillemot size. I built a Guillemot for my wife, and it is a bit too
: small for me. I am a bit bigger than you 6'4", 240 lbs, size 13-14
: feet. I feel cramped in her boat, which is why I am now building a
: Guillemot L for myself.

: I have no experience or knowledge with the other designs, but from what I
: hear if you call/email the designer most of them will point you in the
: right direction.

: Good luck and have fun

: JJ