I was in your position a few years ago. Found that with removal of the steering column I could build a box for my 12" JL W3 with about that dimension. It was a tight fit but I got it sqeezed in on top of the foot rest.
Some pics in my profile. I can snap some more if need be. Haven't had a whole lot of time to be on here much so be patient with me
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Thread: Sub Box Question
01-07-2013, 09:20 PM #112007 Moomba Outback - going, going........
Why Not? Play Hard! Get wet