I used a modification of Pascoe on my rebuild( sorry not a Seacraft). There is method of foaming in a tank that I would consider, and it requires complete sealing the foam and tank to prevent contact with water.
Start with a coal tar epoxy coated tank. Foam tank in place. Trim foam level with tank. Glass over foam and edge of tank to completely seal foam. Last step would be to make sure you instal a drain, so any water that makes it to the tank top flows aft to the bilge.
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