I finally aquired lots of buttons for this project (seen in the last picture). So I tought I could start experimenting with them.
This is the first attempt at putting the buttons in a fret form.

One idea I was given for the fretboard: instead of putting the buttons on a large PCB, I could put them directly on wood (gluing them on it).
I took a piece of wood, made holes in it so 6 buttons can fit, then I glued the buttons on the wood.
The final width of the fretboard i see will be 72mm, bigger than I tought, but I hope this shouldn't be an issue since the buttons are easier to press than normal guitar strings.

I wired up some LEDs so I could see when the buttons are pressed. They can all be pressed at once with just one finger.

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