vented shallow enclosure design

[Likibow]

Hi guys new to the forum, searching for some help on a box that i want to build, i own a ford sport trac 2007 already installed the stereo amps and the subs 2 rockford p3sd4 but the box is to big and the subs hit the back of the seat and doesn't sound right so i took measurement of the area to do this right an the size that works are W48 H13 D4, now my question is the mounting depth of the subs it says 3.65 inches i don't know if that enclosure is gonna work for me since i have limited space here's a picture of the design with a port if anybody could tell me if this works it will be great help, thanks!

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[Likibow]

other thing is building this new box only have a 3/8 clearance between magnet and mdf don't if it's enough or to short for the subs