Potentiometers and sharing guitar module

Hi, I’m pretty seriously considering doing a PCB for a bass (or guitar) based on the Daisy Seed. It would just plug into a standard J-bass control cavity and holes. It would use a flat lithium battery and have a built in charger. I’m sure I could spin a variant for other common form factors. So two questions:

First, I’m having trouble finding concentric pcb mount pots and knobs. That way 4 parameters plus volume can be controlled. Standard practice seems to be to order in the 1000s. Any advice here? It’s the main impediment to getting this project going

Second, if I want to share the design open source, how is that usually done?

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This sounds really cool!

You can order concentric/dual pots from most guitar parts suppliers. Here’s one:
https://www.stewmac.com/electronics/components-and-parts/potentiometers/fender-dual-500k-250k-split-shaft-potentiometer.html?utm_source=google&utm_medium=shopping&utm_campaign=2021-05-gp&gclid=Cj0KCQjwkZiFBhD9ARIsAGxFX8AA5pPyl3Zb0vyHOkPyB9CDkXrB_nKZRGXQPPtD6TsLpzprvO_L3qsaAjjLEALw_wcB

I’m not sure if that’s quite what you’re looking for.

Regarding open source hardware/design I think most people just post their schematics and documents on GitHub with a permissive license so they can be revisioned and contributed to by the open source community. Here are some examples: open-source-hardware · GitHub Topics · GitHub