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You could do what the speaker builders do, build a wire or thin wood frame and stretch felt over the frame then glass it. Depending on how heavy your frame is, this could be a lighter alternative that allows for more aerodynamic shapes.
I've built a few speaker boxes this way and am considering this technique to build a similar trailer for behind my Focus.
I don't have the post count yet to post links or videos so search Youtube for "How to build a Fiberglass Subwoofer enclosure"
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