Audio/Visual & Electronics - Argh, need a new box

I've got 4 Crossfire CF310d subwoofers. I like the novelty of having 4 subs. What I don't like is that I have to have 3 sub boxes to hold them all. Remmy pointed out the truth, that my current setup pretty much cancels itself out. That's why i want some advice on how to change this setup. I would like to keep the 4 subs, not go back down to 2. My subs are nifty in that they require very little volume of air to function well. They thrive in small places.

I had them like this:
http://img.photobucket.com/albums/v153/itinerant/Honda/2subs.jpg

Then like this, as they sit today.
http://img.photobucket.com/albums/v153/itinerant/Honda/4subs.jpg

I know there is room for four 10s in the trunk of a 6th gen. I've seen it before. What I don't know is what might work for me. Anyone have some ideas? sketches? Anything?

Simply make trim rings out of mdf to angle the subs on the sides away from each other.