Need help with 2017 Silverado 1500 crew cab dual 12" sub enclosure build?!? PLEASE!

[Infamous☆M☆PTB]

I'm a super Noob in desperate need of help with 2017 Silverado 1500 crew cab dual 12" sub enclosure build?!? I have raised my rear seats 3" in preparation for more room. If anyone has previous designs/blue prints/measurements for a ported dual 12" enclosure I would be very grateful! I appreciate any help. I have all tools except a router and table saw. I do however have a dremel w/ some router bits but they're too small I believe. Anyone in Dallas TX area would be a plus. Thanks in advance yall! Hope everyone has a blessed New Year!

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[Buck 5,000+ posts]

I've designed several underseat boxes like that. You need to make sure you have enough room to go ported.