Well, first of all.....it's light. We lifted it up just to have a look at it. One person can easily lift the bow or stern. Left chine looks pretty well edge to edge as it should be, the right not quite so good, maybe an Eight out, but it should all fair up pretty well. I guess it will be considerably heavier after we glass the hull and deck.
When I was preparing the bulkheads for the keel box sides, I glued in cleats on the bulkhead faces to hold the bottom of the sides together, since I had no good way of clamping them. Anyway, I fitted the sides so that they would just sort of slide in from the top. I also made up the thwarts out of quarter inch ply so that they were a loose fit.
We relied on the Two pieces of Two inch wide quarter ply on the bulkhead faces for our accuracy in getting everything vertical. Those strips were made up as accurately as our tools allow and they were positioned with reference to the centrelines drawn on the bulkheads when we lofted them.
..So in theory, since the bulkheads are flat, parallel, centred by laser and vertical, we should have a perpendicular keel box, I hope. Well that is the theory anyway.
We filleted and then glassed the bottom to keel side joint, checked to see that everything was glassed, no bare timber, etc, and then glued in the thwarts. They got a fillet and glass where they meet the hull. The keel box side to bulkhead joints were then filleted and glassed.