Re: slightly soft floor remedies
There are a lot of other materials out there, from carbon sandwich sheets, to honeycomb stuff. But for anything with even close to the stiffness of plywood expect to pay much more. Frankly, unless you already have poped for a carbon rig, composite rigging, and 3dl/carbon sails this is a poor allocation of money. The weight is too low in the boat for it to be worth the dollars.