Box for two sq hdc 3 12's

[Papabiz]

So I a SQ hdc3 12 and I just placed an order for the cresendo bc 3500. I'm gonna be ordering another sq hdc3 12 here soon and want to make a ported box that will sound good. I want it to hit low notes really good and just bang overall. It'll be in my 2005 Cadillac Escalade. Can anyone help me on figuring out the dimensions for a box.? I made my own but it was just a single. I want to make one for two of them

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