Hey Brotha!! Ya I really want to build some more, hopefully I can figure out how to go the CNC route for sake of sanity ( are there plans?) . Im playing with various ideas of what a good live sound matching top would be for 2-4 othorns per side. Ive found the QSC pl380 to be a really good match. It cant push a pair of the BC 21-152-4s to the absolute max but it gets fairly close. I've put these things through their paces, and have been loaded in and out of my van like 50 times already. They have done 20-30 small gigs and not even a hiccup with power handling or over excursion. Had em going at a little psy trance gathering (really fast stuff) for 72 hours straight, without much heat buildup at all. I think the slightly less performance of the BC 21" vs the TC sounds 18" is made up for ten fold with the peace of mind gained knowing that the B&Cs aren't gonna suddenly give out.
While I would love to stack them sideways all the time like in that little video, I think it will prove difficult to get those hatch panels quiet without some weight. Im gonna brainstorm that one. Right side up they never make any noise and I have had zero issues with them wanting to move around. I have little black moving blankets they sit on. I saw a pic on the Danley website of that "hardpop" club in mexico. They have one TH on the bottom, upside down, and then another on top of it right side up. This seems pretty clever I hadn't even thought of it, would definitely want four per side when going that route if looking to stack a top on there to avoid tippage.
In my mind I'm kind of dreaming of four othorns with a danley Sh-96ho on top per side.......ugh....that would be heaven. :-)