Here I go again...Fiberglass Sub enclosure??

Okay, so I mentioned to the guy at this shop I went to yesterday that I was lookin to do somethin custom in my trunk for some subs and he mentioned that one of his guys had just gotten back from Las Vegas with some golden new knowledge about fiberglassing trunks for subwoofers? stuff...? huh...?

He was way above my head, and at the risk of sounding stupid(too late) I gotta ask what this is all about.

Are there any links anyone can provide where I could read about this stuff?

Thanks much!