Subwoofer built in cabinet

This is a built in subwoofer enclosure in the back of a 32 Ford Tudor Sedan.  There was very little room, so I made a custom cabinet into the corner of the car.  I sealed the enclosure to get more bass.  I used 3/4 laminated particle board, glueing it in with Gorilla glue and "Great Stuff" to ensure a good seal.  The sound is pretty good.