Well, if you don't remember, I was the dude that wanted the "iso-baric" box plans. I got them. Box built. Love polks, HOWEVER, I want 2 more of these dx-12's. They are the hardest-hitting-best-sounding subwoofer that has ever been in my trunk, and trust me, I have had lots of amps and woofers in my trunk. I am now in the phase of wanting to build a flus-mount totally not going anywhere box(bolted in). I would really appreciate it if you could give me sum ideas about what size and such. I have a smaller 2 door hatchback, with about 38"-40" width and 15" hieght to work with. I would like a box to match the angle of my back seat. I want to do 4 DX-12's in an iso-baric setup. This box would also be my amp rack. I am trying to figure out how to get this all to fit.