One thing I'd wanted to add is that, to my surprise, I'd accidentally chosen dimensions that made it "just" possible to use the stock wire leads on the Rythmik HX800 plate amplifier.
Apparently it's ok to make them a little longer if needed, but it was nice not to have to futz with anything (other than needing 3 hands to get the connections on while holding the heavy drivers)!
Not the best picture ever, but anyway:
