I ripped (with some help from the brother-in-law) some 16 foot pine 2 x 8's into half inch strips. Their still a little stiff, so I'm trying to tease a curve into them while I do epoxy coats on the fiberglass...

I've clamped four of them together (so they'll stay rightside up) and hung individual "weights" (a gallon of water, a couple of toolboxes...) from each separately to start bending the curve.