3rd gen dual 12” sub box plans

Very curious, why are there zero dual 12” sub box plans anywhere on the internet? I understand Mr. Marv has the lockdown on these builds, but he can’t have the monopoly on the plans. There has to be somebody out there that has done it, and has documented the plans on paper.

Does anyone, anywhere, have any plans that will clear both the center rail & the back window motor? I’m exhausted at this point trying to find anything that will give 1-1.4cuft of sealed space behind the rear seats on a DC 3rd gen.

Obviously I’m in the process of doing it myself, it’s just frustrating to not be able to find anything to compare to. Fml