I used to work in defense electronics and I'd see the huge boards where we hand-assembled mil-spec wiring harnesses. I don't want to say they were easy but it w

I used to work in defense electronics and I'd see the huge boards where we hand-assembled mil-spec wiring harnesses. I don't want to say they were easy but it was surprisingly low tech as far as measurement, lacing, etc. https://www.google.com/search?q=wiring+harness+board&source=lnms&tbm=isch https://www.google.com/search?q=wiring+harness+board&source=...