Yikes. thats gonna be tough. Marine plywood does not have to be used and as a matter of fact its proven to not be the best stuff. The chemicals in marine plywood do not allow full penetration of epoxy. A good idea would be to buy some very good grade birch ply or exterior ply and before installation put a few layers of resin on it. But make sure if you wait til it comepletly cures to sand or get a profile again for all subsequent laminations or glassing. i would recommend doing a lot of research on other transom projects on other sights such as classicseacraft.com classicmako.com there are a bunch more that i cant think of. Look into resin types, cloth weigths/angles etc. there is a lot more to it then the pics you see but there are tons of good documentaries on this stuff. Wish you the best of luck captn.
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