I have been a long time lurker on here and a bit of a JBL collector. Stated out as a pipe dream umpteen years ago, but I finally assembled my basement home theater using vintage JBL speakers. Though you guys might enjoy.
It is workable right now, obviously you can see from the photos it is not yet 100% finished, but I keep plugging away at it. It has been a blast to watch movies down there. Yes the seats are re purposed car seats and the "subs" are Atec Valencias (but I am going to swap them out and move the Altecs upstairs).