1/2 inch cabinet grade plywood is being used for the deck. All the pieces were carefully measured and cut. A pattern for the sides were made from heavy brown paper and transfered to the ply. The panel above the fuel tank is a seperate piece and will be secured to 2X2s that will be attached to the stringers and bulkheads. The reason for this is if the tank has to come out in the future, this panel will be removed for access. Too many decks are one piece with the floor and have to be cut to remove the tank.