I'm looking at building a subwoofer from ground up, however i need something to put it in. currently i'm looking at using a pvc pipe fitting, like the pypbomb or fiberglassing something. The thing is 8" pvc fittings are expensive and are too strong since some are 80 scheduling (the pressure system for pipes). for the fiberglass a mold would be needed. Is there some cheap pvc product that can be used for this purpose?