12" ab xfl box help

[Quinn88]

I want to build ported box for a xfl 12 but haven't been able to find much info on specs this will be my first box build (I have built houses though so not to worried about construction) I just want to get it right. I have a civic coupe I can only clear about 16 1/2in in h and around 30in width any help with plans would be much appreciated

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