Shrek, I just posted my transom rebuild. There is no problem using marine grade plywood. If you are going to be a second set of hands to the guy you hire then you can be sure it gets sealed up and in many areas it will be even stronger then factory. I added the link to my thread. I have to find the time to complete it . I now have 10 coats of gelcoat on and am in the process of sanding/compounding. Looks better then the rest of my boat now, means I have to clean it all.
http://wellcraftv20.com/community/sh...ad.php?t=16196