Ok I have about 3.97 cubes (after .75 MDF) to play with in my hatch area. But if I remove one of my back seats (the 3 seats are in 2 different pieces), I can make the box an L shape and get a lot more airspace that way. Like run the box fully across my hatch area but then extend it into the back seat area where the seat used to be. Is this ok or would this cause a problem with subwoofer loading or just bad airflow?