Over time I'm came across many boat building pages on the net and a good portion of designers and builders seem to suggest that normal ply can be used succesfully if small defects are not magnified by having the material loaded up to its limit.

Personally my take on things is that if the F12 hulls are truly easy to buid then it may well be worth the risk to just use normal ply and see how it holds up. If it does crack or something then it can be repaired relatively easily and then the hull can be glasses over.

Once a hull is glassed over the inferiour aspects of normal ply should really not be a major issue in my perception. But it will be best to check with Phill on this matter. Afterall he has 25 years os experience in building these things.

Wouter