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by rmaus 1023 days ago
https://imgur.com/a/wyqPSeo (unsure why this is marked 18+, sorry; it's SFW).

You can see my first build (blue) in several of these pictures following similar advice to OP's guide (looping diodes, etc), with one modification where I used copper tape for the columns instead of wires.

Then the first picture you can see how much cleaner the single-switch PCB ends up, and I can assure it was far easier to solder / strip / assemble.