How do I do this???

[CRXican 10+ year member]

I lack skills but might have the tools. I must have my sub (just one JL 12W6v2) mounted like so:

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[mazdakid 5,000+ posts]

build a box and face them up?

 

[baseballer1100 5,000+ posts]

Or you could fiberglass into the wheel well.

 

[Louisiana_CRX 5,000+ posts]

With a single JL 12...fiberglassing the rear wheel tub is your best bet....