Box build for 4 sundown audio sa-15s

[Jwall1200]

Hey guys looking to build onto my current system. Im looking to build a box with 4 sa-15s would like to wall but also wouldnt mind to have just a box laying flat. I have no idea where to start with this box build any little information will help. I have a 2005 ford explorer. Thanks alot to whoever responds!!

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[02Blazer]

this is a box designed by Joe X when i was thinking of doing 4 sa 15's , went with two sa 12's in my blazer instead