WTB dual SA 8" sub box designs for ext f150

[KPs02FX4]

Looking to put 2 Sundown SA-8s under my rear seats in my 02 ext cab f150, front facing is preferred. Jacob recommends the subs to be ported so I'll take his word. I would like tuning around 35hz(I listen to rock and rap), I also hear these subs aren't o forgiving in larger enclosures so I'll want them to be under the passenger Side back seat (the 70 of the 70-30 split seat) rather than one on each side of the truck. I can get measurements of where the brackets are so as to build the box to fit nicely around them for a clean install! Thanx

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[ssteele18 10+ year member]

What are the max measurements. It may be hard to tune it appropriately but, possible if dimensions are forgiving enough.