4-15s Wall Box Build

[SaMoT405]

Okay guys so I am going to build me a wall in my Extended Cab F150. I am going to be using 4 PSI 15s on a temporary Sundown 2000 until I upgrade to a Bigger one. But this is what I have going so far..

The specs for the box are: 40x48x20. HeightxWidthxDepth. The total Volume without displacement comes up to 19 ft^3. And the tuning to 35hz.

I just wanted to see if you guys think this would work. And also for the bracing I am not fully decided that I am going to be using what is in this design. I need some feedback to see if this would work or if I need to change it up..