Have you done any fiberglass work before ? First, you will need a range of power tools - after that, the choices in materials will drive the cost - polyester resin and marine plywood is the low end route, epoxy resins and composite (non-wood) coring will be the high end route, you're probably looking at something between $1500 and $4000 to do a complete floor replacement.... mostly spent in beer, while you sweat thru the job
just a rough guess -
Bill