pro-rabbit
5,000+ posts
Moderator
Sorry, didn't take much of pics but yes it is fiberglass.More pics or possibly a build log? Fiberglass? I'm about to be doing an install in the same vehicle with the exact same thing in mind (except I think I'm putting the sub on the passenger side plus it will be ported).
These cars are rather straight forward when it comes to the side enclosures. Make a base to sit on the floor and since some of the sides are some what straight/flat you can use a few sections of wood along the back. Then just put the sub and port where you want them and you are pretty much good to go. The carpet on the sides is about 1-2" form the side of the car so you can even mold to the car and go 3-4 layers of glass thick..and rage gold and still fit just fine.