Here's some pix of my audio install i did about a year ago. I figured I would post this to give others some ideas. Sorry for the crappy pics.
The deck.

Front kick panels and door panels.

Rear speakers.

Heres the sub box.

I have the amp in the drivers side cubby hole under the rear seat and distribution blocks hidden under the passenger side in the other cubby hole.

 

that is soooo sick, you should definitely do a write up on how you got your sub in the rear seat. i was thinkin of doing the same thing because it wouldnt take up any cab room lol but thats wicked

 

did you keep the stock amp?