Thanks all for the sage advice, thoughts and encouragement.

Paddling out this morning among the porpoises, sea lions, dolphins and giant jellyfish, as I was passed by a paddle boarder, I came up with this idea:
Order plans and build Nick's Mystery, (Nick, any thoughts on what might soup up the Mystery, that are outside race rules? Stretch it to 21'? 22'? I don't race, so it won't be cheating.)

Once I'm on the water and having a great time with my Mystery-variant, and the cedar slivers have worked their way out of my hands, I'll consider what to make next, maybe even an outrigger.
Those guys seem to be very quick, 6-7 knots. But why only one paddle blade? We walk with two feet, we hold paddles with two hands, even outriggers hold their paddles with two hands--but only one blade? I asked some outrigger guys one time and they looked at me like I was nuts for asking. One guy said someone he knew had once tried a double blade but was too slow.

Another realization I had since yesterday. Which part of a (swedeform) kayak should have the greatest draft? (lowest point) under me, or just behind me where the widest part is (55percent)? If I don't have a clue on that simple aspect--I might build a kayak based on my opinions instead of building based on actual knowledge and understanding.

Will