Here's a run down on the system.
JL 500/1 for the subs, which are 10" W3's.
JL 300/2 for the front speakers which are MB Quart DSD 216's.
Pioneer DEH-630 head unit.
12 disc Pioneer disc changer mounted in the center console.
Hidden in behind the box is a 1 farad cap. I removed the jack but the holder is still in place. The jack lives in the jumpseat hole now. I removed the seat back of the jump seat to make room for the jack. The jack is wrapped with foam rubber to prevent it from rattling around in there. Main wiring is 4 quage Soundstream audio power cable. From there it is split into 8 quage to the amps. The mounting brackets for the box are from my 12 disc changer.
After making templates out of cardboard I built the amp rack out of 3/4 MDF. The amp rack is basically a frame built around the sub box I already had. I then applied the carpet with 3M spray on adhesive. I was going to make the entire thing black but I liked the 2 tone look. I really wanted to build a frame that would allow me to show off the crossovers, distrobution block and cap but I would end up with no room whatsoever behind the seats. I wanted to leave a little room for stuff I have to haul back and forth from work.
BTW, it hits really hard. At times it feels like someone is kicking the back of my seat. I love it.
That should answer a bunch of questions.