From what I've read the speakers are 4 ohms. I see what you're talking about with the trunk space. I suppose you could possibly fab something to work in the space, it is kind of wasted space. You probably would be stuck with having the trunk mounted all the time unless you wired the sub and amp with quick disconnects. That access panel is where the four bolts that hold the trunk in place are located. There is a filler panel that you can purchase for around $100 that fills in the empty space left by removing the trunk.
08 Vision Tour - Midnight Cherry