I figured it was like 4 boxes haha. That other design defiantly looks a lot better. I might make a new box after I install the subs In the box I have built already. Thanks for all of the feed back.
Give you pro's for trying, I'm also building a 4 12" system in a Avalanche. My advice is drop some cash onto Bucks paypal and call it a day. Unless you want to learn and by that i mean build destroy boxes.