I've been practicing making fiberglass enclosures for a while now. This I think is probably my 3rd enclosure. This sits in the rear of my hoopty/beater 86 Accord.

Pic 1 - Mold inside car
Pic 2 - Mold shape w/cut edges
Pic 3 - Mold with mdf ring
Pic 4 - Mold wrapped in fleece
Pic 5 - Box with rear cut out
Pic 6 - Box sealed with sub before bondo
Pic 7 - Box with bondo/rage gold applied
Pic 8 - Box painted silver
Pic 9 - Completed sub box loaded with subwoofer