Piano Music Box

Same as the very cool original, with some minor adjustments:
Redesigned for 4 mm sheets (hard beech plywood with 3 mm is difficult to get here).
Removed the cutouts for the mechanic. If you need mounting holes, either drill or draw in fitting your own unit. I had an old, spring loaded mechanic, with can be winded up from the bottom.
I recommend using kerf compensation for a robust and easy build. If you paint the black keys as I did, do not darken them with the laser (as in the original), as the surface degrades.