After purchasing Nick's book, I am building the Great Auk. Nick states in his book if you want a bit more performance to scale the cockpit opening. Should I scale the opening concentrically, from the back edge, or the front edge? Or am I just splitting hairs? Any recommendations on size? Could I use the Guillemot's cockpit dimensions? If it matters, I am on the tall side and have scaled the kayaks beam to 23 inches.

Thanks for your input, Rick