[Single SA12 D2 Enclosure Design help]

There was not enough Port Area Per Foot before, now there is

[Single SA12 D2 Enclosure Design help]

To start off i have never designed a box, so please keep that in mind. I have had 4 subwoofer setups prior to this one. i have had kenwood, kicker, alpine twice, and now i finally have something that is worth braging about. The SA12.

BRZ1200.1d

SA-12 D2

going into a Ford Focus 2012 Sedan

Now i want to build a box that is tuned to 29hz for daily/ 55hz for spl burp

dimensions available are:

Height 14.5"x Width 30"x Depth 20"

I plan on using aero ports and attaching them/ it with hurrican nuts so i can change the tuning from daily tuning of 29hz to spl burp of 55hz

This is what i came up with using Torres Calc, any input would be great!

Thanks, Zac