Sundown X12 D2 Box Design at Design

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Sundown X12 D2 Box Design. I want it tuned to 29 hz but the guy said he would have to make the box quite a bit bigger and have to build it in my trunk which would mean $500+. I have an updated design for the new v3 sa12 here:

SSA Store Sundown X12 subwoofer 12"
SSA Store Sundown X12 subwoofer 12" from store.soundsolutionsaudio.com

The sundown audio x12 v3 d1 has a bigger motor and graduates to the zv5 coil. That sub only had a mounting depth of 6.5. Anyone have any exprience with the sundown audio x 12 sub as to which box specs work best with it?

SSA Store Sundown X12 subwoofer 12"

Sundown audio has added 500 more watts to the power handling making it one of the most potent 12. Any and all input is appreciated! So also more linear xmax. Subwoofer sundown audio x 12 v2 d2.