Doing a core repair like what you describe isn't rocket science and doesn't require a whole lot in the way of esoteric tools or knowledge.
Depending on the size of the area, your skill at fiberglass repair, and such, you could probably do this for less than $500 or so in materials in a weekend. Several of the boating magazines have had articles regarding this exact subject in the past five years.
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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.