HULL STRUCTURE EVOLVES
The two beams on the floor in the first shot haven't yet been fixed in while we nut out their final location, but they will fit either end of the centreboard case. We'll then glue a couple of stringers (skids) lengthwise under the hull, so the structure becomes a grid with plywood holding it together. Every bit of structure then ties together to form a light, but quite rigid shell.
Note that when we replaced the bottom with "proper" 6mm marine ply the floor had enough rigidity to do away with the skids.