4cyl: I thought about doing a sub box for mine right there.... however right now I have a rf 10 in a truck box.... i sat it on top of the rear seat delete and it didn't put out nearly as much sound due to the fact the sub wasn't bouncing the sound off the hatch. Something to keep in mind.
Cyberstang5.0: I'll take some pics of the inside later and post them with a description of basically what I did. I made the top piece where it lifts out so I could put my amp and speaker wires and stuff underneath it(and anything else I might want to hide from people
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Oh and I weighed everything that I took out of the car and it comes out to a little over 60lbs... the wood/carpet and stuff I used for the rear seat only weighed 10lbs max so that's a nice 50lbs savings...