some of the seacraft guys just lay the new floor on top of the edge you left when you cut the old one out, this raises the floor the thickness of what ever your making it out of, the idea is to help the boat to self bail. I'm not sure it helps that much, but it does make it easier to attach teh new floor. You will have to raise the stringers, most people just glass strips on top of the stringers the thinkness needed before laying down the new floor. there are several threads on this site about repairing the floor, if you need more info, check the classic seacraft site, and the classic mako site. there will be more info than you ever asked for
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