Single Shallow 12" Sub Behind Rear Seat in Crew Cab... Box Dimensions?

I have tossed around the idea of a powered sub or bazooka tube for a quick, easy install. But the kid in me wants to go with a 12" shallow mount kicker with a 1000w Mono block amp.

I have built several boxes in the past but wanted to see y'alls ideas before I embark on this adventure.

I need between 1-2cu.ft. sealed air space and about 4.5" mounting depth. I have the power window and don't mind cutting some of the carpet away. I plan to put behind drivers side rear seat and remove the tray. I should be close to 8.5" on the bottom by doing this and hope that would give me room for mounting depth...

Has anyone else created a single 12" box with room for amp and tire jack?