Keepupboardfast, you had a question about the boom-less rig.
In the early 80s most of the homebuilt and custom 18Sq had boom-less sails. The theory for the deck sweeping sails came out of the C=Class cats. I will probably go boom-less on the A-Cat I am building just to get it in the water. Then see how good (or bad) the sail shape is, and how controllable it is.

The picture below is one of Bob Bergstedt's 18Sq from that time frame.