When the factory assembled the boat, they slide in 2 pieces of plywood buttered up with potter putty in between the inner hull and outer. That is what makes the 'box' you are talking about. It sounds like the ply has all rotted away and so may have the brass drain tube. That could be your leak.
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Patrick from WAY out on cape cod.
1973 23foot Center console, Birdsall Ttop, Hermco Bracket... in progress
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