So i just finished my box today after alot of hard work and here are the results. Ive been working on it for a very long time. I took off the right carpetted side of the trunk and fiberglassed into the empty space back there to add some volume. the sub is a infiniti kappa with an ma audio 1889i amp.
If anyone is interested in buying this off me, please pm me with a price. I would like to sell with sub and amp included because the box fits the sub best.
Anyways, you can get to my spare wihtout taking out the sub because you can slide out the bottom false floor from the left side and pull ou tthe spare. Also you can still recline the seats without touching the box.

The sound is great after i tuned the amp. Hits real hard since its a hatchback and theres no real separation between trunk and car.
EDIT: changed the pictures to day pictures cause the night ones sucked.

 

but you can't open the thing up to get underneath it./

 

I assume you're talking aoubt that false floor thing. to get to that, i have to pull up the left bendable part and slide the whole thing to the left and out. and there you can see my amp and spare.

 

nice install