Bly - good to see you hear. I rarely participate on this board because I have a Bertram20 project, not a Seacraft, but the restorations here are outstanding.
I exclusively used Coosa board on my Bertram for transom and sole replacement.
One thing I found I needed to do was clean the coosa very well or lightly scuff sand then clean with solvent and put a nice flood coat of resin to make sure I got a good bond.
Curious if you have any tips on proper preparation. I also used vinyl ester exclusively, although next time I think I will save some cash and only use vinyl for secondary bonding and not for panel layups.
Looking forward to the progress.
I think I posted this link before, but here is a link to me stalled project.
http://simplifying.net/phpbb/viewtopic.php?t=1028