Hi Rictorn,

are you intending to run twin forestays or a bridle? From my experience altering a A class to F16 with a bridle, the hulls need to be heavier than what you are describing. Horizontal strength ahead of the main beam is essential as the bridle loads try to pull the bows together. <img src="http://www.catsailor.com/forums/images/graemlins/blush.gif" alt="" />

I would say that the framing inside is probably more important than the plywood skin, which is the only thing you have given info on. So what is inside?

Regards Gary.