It's a shame I live on the other side of the planet, I am a sparky too so I could help with the wiring.
I have been scratching around for Electrical work and it has been a bit slow, but I have also been given a job reviewing somebodies embedded electrical project, It is quite interesting but I'm afraid my assessment is a bit damning. I didn't want this as I know how hard it is to finish projects let alone make them perfect. Anyway my client says don't hold back, they want the truth, and there have been more than a few failures in the field.
Hopefully this will lead into a replacement board, I want to go Arm m3 or maybe m4. 32 bit code yay. 8bit does get a bit annoying.
Node Zero, I'm not familiar with this term.
Sounds like you have big plans, you might have to resign your day job to implement them.
I made up 5 x Steff 0.4 they all work, my production techniques need refining, but each time I try a different way and learn a bit.
You have to manage it so that the solder pasted doesn't dry out before you finish placing. I think the vacuum pick up idea is good but I haven't managed to do it. RE. Mikes Electric Stuff.
All the boards work well, I have only mounted one of the version 0.4s. My lab has 3 led lights now, more than bright enough.
I added a switch to them so when they are turned off they draw just about 10uA.