Thanks Psch91!
I did it myself - it helps to know how to fiberglass well.
It sounds great. The box has about 0.56cu ft, so for a 10" sub I had to "stuff" it with fiberfill. It sounds good. The bass is deep and pounds good and it's not obnoxiously loud to the outside.
The sub is angled since I knew I'd be putting one on the other side as well and didn't want to have the sound waves interferring with each other.
I can't wait to finish the other side :P and mount my new JBL GT1081's!!!!
It doesn't take long, well aside from the fact that each FG layer has to dry before you proceede to the next one. If I wanted to, I could have it all done over a weekend and a bit.