Box shape help

[Cec]

So im wanting to build a box that sits between the seats in my transit 250. The ebrake is there so im wondering if I can build a leg sort of, and then widen the box once above the ebrake. Does the shape matter? It would be a box with a smaller portion of the box towards the bottom. Would this be ok or should i separate the lower section? Id like to use it for more airspace if i can.

 

This is a rough shape with my keyboard lol. Speaker on top by rhe way.

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Got all the measurements planned out with the right air space I need. It will be sealed with a 12" 1000w rms sub and a 2000w monoblock amp.

 

Main question is, will the oddly shaped box work or is it going to sound worse than a squared box with something underneath to raise above that ebrake