I've been working on this project for a while and finally finished it up this week. I re-did the entire audio system including a 205 amp alternator, big 3 upgrade, audio battery in trunk, 4 amps 2000 watts, 1 W7 12" sub, and a total of 13 speakers.
I also modified the stock nav system to hold a aftermarket dvd/nav system where the 6 disc changer was. I have headrest monitors, back up camera, bluetooth, ipod control, wifi and lots more features. Also removed the rear arm rest and built a custom box for speakers in its place.
Here are a few quick pics from my iphone, I'm thinking I'm going to remove the cadillac vinyl decal from the sub but other than that it's finally complete! Trunk is wrapped in the same suede I did my headliner in: