Pre staining the cockpit recess so it will match the rest of the boat.
It is very common that the deck and hull don’t match when you go to put them together. Maybe humidity got to the wood between glassing the outside and the inside or, the opposite, the wood dried out. Or it could be that the deck or hull sagged a bit while sitting on the saw horses.
If you want to build a lightweight, rugged, and beautiful small boat, combining thin strips of wood with epoxy and fiberglass will make a cartoppable, low-maintenance, and gorgeous vessel. Nick Schade has been building strip-built boats for over 30 years.