In looking for places to mount some speakers, seems like the headliner over the driver/passenger seats might be the best place. I saw the ultimate windsurfing sprinter had this setup. The liner itself seems sturdy enough for it, maybe with a thin piece of wood behind them to screw the speakers into. What I was curious about, was how much room was behind the liner. It seems to flex a bit, so makes me think there is some room behind there, but I just don't know how much. I'd prefer to come up with a plan before trying to take it down. Probably dynomat (or equivilent) behind it if I go this route. Probably some 6.5" components.