I'm building a 16LT from plans, and I'm as far as having the hull assembled with the copper stitching, but no epoxy yet. Before making everything permanent, I'm carefully aligning the plywood panels and snugging the copper. Mostly so far so good.
In sighting down the keel line with e hull upside down, however, there is a sizeable and noticeable "hump" toward the stern, with amidships and bow much flatter. I've tried squeezing, pushing, & clamping various parts to try and adjust the shape; but I've come to the conclusion that the shape of the bottom panels need to be adjusted.
So what to do? I could live with it as is. (No, it's too severe for that.)
I could completely disassemble the boat and recut the bottom panels, then reassemble & hope for better.
What I'm thinking, though, is that I can unwire just the hump area and make the adjustments in place by cutting along the keel joint with a jigsaw, slowly removing incremental passes strategically and gradually until the hump decreases.