Using Bassbox 6 pro, I modeled several ported enclosures, and by toying with dimensions and some of the stock ports that were available, I was able to come up with a design I thought would be suitable. A box built using 3/4" MDF and external dimensions of W=10.5", D=12", H=40" with a 2 7/8" diameter port 5" long gave a Vb of 2.058 ft^3 and an F3 of about 34hz. I planned on starting with minimal stuffing, but playing with different amounts to find the right amount. The basic design of the enclosure is available as a PDF.

This enclosure design makes it easy to get all of the dimensions the same when cutting out the wood, since the front, back and sides can all be cut 10.5" by 38.5" and the top and bottom will both be 10.5" by 12".

My planned crossover point was 2000hz so I set driver spacing at 6.5" c-c with the drivers all surface mounted in the centerline of the baffle, with the tweeter centered 3.5" below the top of the baffle before the top was installed or 4.25" from the top of the finished speaker and the port 6.5" c-c below the woofer.