I am currently working on a design with the same dilemmas. The major difference is that I only have one square ten. The best thing (sound, space, look etc) we've come up with so far is building the box so it spans the whole space behind both seats to get the desired internal volume. The issue with the square ten is the mounting depth of the speaker vs. the minimal space to work with w/o eating the steering wheel, so to remedy that we are going to reverse mount it and posiiton it on top of the box and in the center, about where the center console ends. It will be like a upside down T. Speaker in center, box spanning left and right. I am also ditching the rear speakers. They are poorly mounted and can barely be heard. Mine will have components (1in + 4 in) in the dash, Q-forms kick panels with 6 in, and the sub. 1 five channel amp that we hope to mount above the box behind the seats, haven't gotten that far yet. I've been thinking about the whole thing for a while to think of every possible option, but the bottom line is the lack of space. BTW I want absolutely no hacking of the truck and that makes it all the more interesting. I hope to start working on this within the next month and will keep you posted on our progress if you would like. HTH