The next step is to attach the sub ring that I had cut out of an MDF board. I used hot glue to attach the dow rods and then glued it to the back of the sub box.
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Now take an old T-shirt and stretch across the front of the sub box and use the hot glue to secure it down.
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I then used a marker to outline where the border of the sub box is
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Soak the T-shirt thoroughly with resin and then layer it with fiberglass mat
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I'll let it dry overnight and then cut out the center and continue layering the resin & mat from the inside.