Excuse me, parking lot LOL Anyway, on the inside of the panel you could take fiberglass chopped matt and resin and reinforce them. After that I would put a layer of deadener on that as well if not non hardening modeling clay. The q-logic panels are completely open on the back side. It isn't that difficult to close it in but it would require some glass work. If you want to know how I'll send you some pictures. As for volume, you will want it to open up into the open area behind the kick panel, usually it has a small plastic piece over it or it may be completely open. Sometimes wiring will be run through it to go to the doors.