94 F-150 Skar DDX 12 on Skar T-1400.1 Box help

[94F150]

I have a 1994 Ford F-150 EXT CAB. I was going to take the center console out and build a box in place of it and bolt it down. I have 18"W 12.5"H 31"L. 40"L Is max I would much rather it be 31" I will have the amp gain truned down to about 1100 Watts RMS because my voltage will not drop below 13.3 at that wattage. I need help designing the box and if anyone could help me out it would be awesome. I was thinking port or T line I have no idea but not a sealed box.

Thanks for the help.

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