That looks like a lot of work! I think it would be better to make a mold inside the spare tire and fiberglass it and then bond the baffle to it. You will gain substantially more air space than the method you are using. With a fiberglass enclosure there you would have enough depth to use a conventional 8" sub which will out perform a flat 10.
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To the optimist, the glass is half full. To the pessimist, the glass is half empty. To the engineer, the glass is twice as big as it needs to be.
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