My first JLCPCB order arrived yesterday - I am so excited! 8^)
I will be soldering some of these up later today...
I also have a pogo-pin programmer so I can re-program the Arduino Minis in place without needing the 6-pin headers soldered on. (I messed up with the placement of the screw holes here, but I can work around that...)
... and the "Universal Block" module works perfectly! 8^) (I will upload a demo video in the next day or two.)