you could also build the trunks like the latest a-cats - they can accomodate straight or curved boards. The top and bottoms of the hull are shapped to the board profile. The trunks inside the hull are simply big and flat with plenty of free play. So like a box that you exchange the top and bottom on(permanently), depending on the board? Keep at it Mike.
"I said, now, I said ,pay attention boy!"
The cure for anything is salt water - sweat, tears, or the sea
Isak Dinesen
If a man is to be obsessed by something.... I suppose a boat is as good as anything... perhaps a bit better than most.
E. B. White
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