Help with fourth order design

[jessdabest77]

I'm doing a fourth order box for four JL Audio W6v2 12's. My dimensions are 49" wide x 41" depth x 19 1/2" height. Can someone design a box for them cause I'm having trouble where to place the subs? I wanted across the back but they don't fit. I am stuck guys any suggestions or help would be greatly appreciated. Also if I have them two on left side and the other two on the right facing each other would that work? Again I need help. They'll be pushed on two Fosgate Power 1000's.

[jessdabest77]

Another question is would it sound louder with part of the port in the box and other part outside of the box? This will be a cut through in Silverado.