I have not determined the cabinet yet - something like the one you show, the Stonehenge III, or Billfort's version. Probably more tall and narrow than short and squat.

First I am planning to build up a 'test mule' for open baffle to see what that sounds like. I got a 'scrap' piece of 3/4 mdf from a local building site (happen to know the contractor), and with a little effort will put together one open baffle. That should give me a good sense of the sound, and also the trade off with regards to diminished bass. I imagine that it is quite system, room, and design dependent. Based on what it sounds like to me, I will decide on whether I want to proceed with a real open baffle implementation, or move on to deciding on a specific cabinet build. I will also try to find out about TL cabinets as well, just to cover the bases. I've only looked at that a bit, and have been unable to find any plans for TL.

regards -- Roger