I just added another center form (#11 in my case) to push the 2 ends farther apart. Then I figured out where the center of bouyancy would have been to figure out where the cockpits should be. If I remember right I don't think I moved them very much.

The Guillemot Double cockpit and the single guillemot cockpit are not the same shape, so I used a guillemot size cockpit in the middle, and stretched the other cockpits to the size of the doubles, but maintained the shape of the single.