This is how I plan on doing the floor in my 20' cc. Billythekid did an awesome job on this one. Your stringers may be the twin wide ones instead of the quads but you can do it about the same way. Molding the floor section will make for a lot less sanding in the end vs laying the wood down, laying glass on top of it in the boat then fairing and sanding your brains out.
http://www.classicseacraft.com/commu...=18607&page=14