I'd agree with SF, a professional surveyor should probably be brought in. One problem with foam cored hulls is that they can "delaminate" by tearing the foam core material, and it will generally still sound like good laminate when you're tapping it, but it won't have anything near the strength of undamaged laminate. This kind of damage is more likely with ductile foam core materials, rather than rigid ones, which will generally damage the skins rather than shearing.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.