Lloyd Sumpter wrote:

I think you have the image sideways, though: the seam is longitudinal.
Think of a jonboat-like structure, where I'd be bending the bottom up to
form a bow, and the seam is lenghwise down the keel.

That's a very different animal than I was envisioning. Since the two
pieces are parallel to each other, why can't you bend them in place and
glass the joint afterward? Or, you could butt join them with glass only
on the inside. Since the bend is along the joint rather than across it,
that should be strong enough.