Tips Or Plans For A Quad Subwoofer Enclosure?

Im am planning on making a subwoofer box to fit Four 12" Subwoofers, the wood i will be using is 3/4-inch MDF wood, The sub needs a Minimum of 1cu^3 of area and a maximum of 1.5cu^3 volume, The box i want to make needs to fit a 1997 Plymouth Neon, and i ive calculated that in order for the minimum of One Cubic ft area the sub needs, i will need to make four boxes that are 13.5 inches, that means 13.5 x 13.5 x 13.5, But they will all be sharing a wall because each box will be sealed for each sub. Any tips on anything to do for this? or know of any plans i can use to do this?