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The new sub: MB Quart RLP-304. A shallow-mount sub of approx 3" depth

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Roughed-in upper MDF ring

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Critical depth check. You can do all the math on paper, but it never hurts to take a few actual measurements before getting too far in to your project!

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Lowest ring is for the sub, middle ring will be for a flush-mounted grille. The circles were done by jigsaw and turned out decently. A final carpeting will hide the remaining imperfections.

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Glued and screwed together, with caulking around layers.

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Cardboard template for terminal mounting box

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Terminal box installed. I will fiberglass around this, which will provide a relief area for the terminals and wire.

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Bowed-in section of fiberglass will allow for a "handle" relief. There is a natural depression in the trunk tub near the body mounting bolt. Keeping the upper MDF ring full size but moving the fiberglass inward here will create a handle that can be used to lift the enclosure up for removal.

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Almost finished with masking for the first fiberglass layer.

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Base layer of fiberglass down. Lots of air bubbles but the basic shape is good enough to build on.

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Form, pried out of the tire well. Time to clean up the rough patches and continue to add layers.

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The "lid" is now on the "bowl". Next step is to angle grind the bowl so it's more even / flush with the lid.

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Post grinding with fiberglass "kitty hair" fill around the outside & inside edge. Looking real ugly at this point!

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Looks like a gross giant pineapple upside-down cake to me. A second layer of kitty hair was applied and sanded down and a final fill of resin applied to fill any remaining interior & exterior voids. Next step is to smooth and paint. A few bits of tape which refused to leave have been sealed in with resin. Not planning on spending much time prettying up the bottom since it will not be visible when installed.

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Courtesy of a temperature drop, the last coat of resin was taking forever to cure. You can see where the fuel tank access panel is molded into the base and the location of the wiring terminal box.

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Base and inner rings are painted. Inside, the silver top of sound deadener. The bottom of the enclosure had some resonance - a few layers of gutter tape minimalized it.