...sorry, I lied. They pictures aren't at all pretty.
I'm probably going to be doing (6) 12"s in my 4th order soon. I'm trying to decide if I should do subs stacked vertically with the port behind the drivers seat or subs firing up with a top port.
The first pic is from the top looking down. The enclosure has to narrow where it goes between the wheel wells so I'll have to invert the very back subs.
The second pic is from the side (hence the poorly drawn seat for reference) and shows the subs lined up on the bottom of the enclosure. The advantage to this one is that the bottom of the shell is flat, so I feel they will have better loading. The probably is that I rarely ever see anyone do this (I think someone here did it with two Crossfire 18's in a TC), so I don't know if I should try it.
Either one will be about 7 sealed and about 18 ported at 45hz.