Here's the door to start with:
Next, I made some MDF rings and pointed the speakers where I wanted them, then glued the rings in place:
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Next, stretch some lightweight fleece where you want your enclosure to be. Do this with as few wrinkles as possible to make for less sanding later. It's usually possible to stretch it so it's totally smooth. In my case, I wanted my enclosure to follow the top line where the factory grill was, so I got some heavy cord (the yellow stuff) and used a screwdriver to shove it in place. I then trimmed the extra fleece around the top and used a hot glue gun to attach the bottom of the fleece to the back of the door panel:
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Once you have your fleece stretched and glued to the desired shape, it's time to apply some fiberglass resin to harden it:
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After the resin has cured on the fleece, the shape is set and you are ready to lay up the actual fiberglass mat. I did about 3 coats of fiberglass mat to make sure it is strong:
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After that's dry, if you want to save yourself an hour's worth of sanding, apply an extra filler layer of resin on top to smooth everything out:
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Once all the resin has dried, your enclosure is very strong. You could stand on this thing and it wouldn't budge. Now comes the fun part...start sanding for about 3 years until it's as smooth as a baby's bottom. For any dips you can't get out, add some auto body filler like Bondo:
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Let that dry and sand for another decade. Finally, you'll get a totally smooth surface:
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