I guess that was a "radical" curve in the shear panel, near the stern, because a section of it managed to pop free, while I was wiring. I re-glued it back into place, with a bit less curve, figuring that I can always plane off more material.
This time, I took a little more care in aligning the panels, even using a few steel wires in the stubborn spots. There is still about a 1mm gap for about 1 foot near the bow, but I can deal with it. I had the bright idea of using a cake decorator to apply the epoxy, but "ketchup consistency" was too runny. I used a small paintbrush instead.