Where can i find a box for a cerwin vega stroker 12"?

Question

The port has to be tuned 40 hz. The total volume has to be 2.25 cu ft and the net volume has to be 1.78 cu ft. They also want the port to be 20" long.

Answer 1

in yours or your friends shop, buy the materials and make it.  I've done all of mine.