Given that the hull is that thick and that the inner hull surface is relatively flat, I would have to agree that there really is no need for a backing plate.
The only question I have is have you check to see if the hull there is solid laminate. Some boats have cored hulls, if yours does not...then don't worry about it... if it does, then you should make sure the area is solid glass rather than cored laminate.
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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.