Loved the idea, I think the execution was a little off. On the piano especially, I had no idea where anything was meant to go, so it was really a random attempt at placing it around. The guitar naturally is very easy to know where pieces go but it almost felt too easy.
- If I were to try this again, I would pick one instrument, and maybe go into a bit more detail. For example on the guitar, you could have the player place each fret, and have a tool to measure how far they should be. Then you can guide the player, and add another level to the creation of the instruments