> 1. Here's the spacing rational, which is easy enough to change...

I think you're trying too hard to have frames near the stems. The stringers come together at the stems, and create their own strength. And, aside from causing the long frame spans, it also leaves little wood to work with on the end frames, themselves. Look at frames 1 and 6: http://www.flickr.com/photos/wwfloyd/5914259080/in/photostream/
On frame 1, there's barely any meat between the two lower chines (though running that chine more vertically would have moved it up an inch). On frame 6, there's only 1/4 inch of wood separating the gunwale and chine. I'd suggest moving frame 1 back 4 inches, and take that 4 inches out of the frame 2-3 span. That would leave three sections in a row with 30 inch spans, from cockpit, forward. And, move frame 6 forward 2 inches, and take an inch out of each span behind the cockpit.

> 2. Can you elaborate or show my a picture of the deck shoulders...

There's a new pic in this post. The bend is not as severe as that image from yesterday makes it appear. I did eliminate the hint of shoulder from the frame 1 template. I think the lines would be cleaner if I had run the shoulders up further (if I could have bent them more) -- all the way to frame 1, and with some added swoop. There may be a better way of mating the shoulder to the gunwale, or, maybe I should have notched it into frame 1. Moving the shoulder notches on frame 2 inward might help, or might create it's own funny effect. Not sure. I'm pretty sure that just ending them after the main span would leave a funny dip in stretched cloth. Here's a short video the illustrates the transition I was going for. It sort of works, but, I sould see from the plastic wrap skin that the result is imperfect: http://www.flickr.com/photos/wwfloyd/5995877530/in/photostream

> 3. How does the distance between the rear of the coaming and the front feel?

Cockpit size? Fine. It's comparable to many commercial sea kayaks. I'm hoping I got the cockpit front height right: for me, it's difficult to find the right balance of having enough knee and foot room, yet not having the coaming too high, and in the way of paddling. When I did the 97% adjustment, I saw that the cockpit front height would be reduced by 1/2 inch. I put 1/4 inch back into the deck height of frame 3, and 1/8 inch into frame 2.