I realized I'm not only on time, but also within budget.
Two things that do NOT normally coincide.
Today, I finished my "H" frame Open Baffle subwoofer. I used two 15" Jamo drivers, juxtaposed. While the JBL drivers play a little deeper, the Jamo drivers sound more "fast" to me, resulting in not as much over ring with the bottom octave after massive excursion.
I've had it ready for testing for a couple of weeks, but by "finishing," I mean paint. I painted this one white to match my other Open Baffle speakers in my listening room.
Obviously, one can not just have one subwoofer when running a stereo system. I plan to get another built before winter is over.
Little tough to do any sawing with my ribs yelling at me. Preparing surfaces, removing the drivers and painting was no trouble at all.