Sub box build with 12" Kickers

[NanoTechnician]

Hi,

I'm helping a friend design a subwoofer box for his car and this is my first design.

Using:

Kicker CVX 12. (2.25 c/ft)

Rockford Fosgate P6002.

17x38x18 with 1/2' MDF.

Here's my design in 3D using Sketchup >Untitled - 3D model - Sketchfab

Saw a video on Youtube (3:08 How To Build A Subwoofer Box EXOcontralto) where they had turned the rear wall around and made it 3 1/2 gap which confused the heck and question my design. Does the pressure of the sub push up against the wall that much tho?

Also, my volume is 2.1c/ft but the spec sheets says 2.25. Is 0.15 difference ok?

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