I would certainly appreciate some help with the rocker design. Some measurements off a board boat would be helpful. Here's how they would be useful:

Length of waterline of boat measured.
On a flat surface: set the boat so the bow and stern of equal height above the surface and measure that height, as well as what part of the hull is in contact with the ground.

For example: A Prindle 19 has about 18'9" of waterline. If the bow and stern were each 2" off the ground, the section of the hull touching the ground would be 8' from the stern.
(The above example was total random guesstimation, but information in that format would be helpful to me.)

Or... if you can use some sort of board or chalk-line... make a line from the bottom of the bow to the bottom of the stern, and measure the deepest part of the hull and it's location relative to the stern.