Lunatic Fringe eh? Lunatic???Well what about :

Turn to cart 2a again, use solid wheels, make front and rear stays adjustable. Put the whole shootin match in the water. When you want to go right, pull on the right front stay, Left use the left. Its a Rudder System!!!!

Or use as a centre board, pivot forward to turn upwind, backward to go downwind. Even brian cunningham may be interested!!!

Or use bigger legs, turn on its side, throw on a tarp - Its a big tent structure!!!

Or turn the assembly upside down on the yak, throw it all in the water, add some sail cloth - its an adjustable sail system!!!!!

-lunamick

Or just plunk on the stays - Its a gut bucket!!!!