Hello!
I like the idea and concept of your modular synth, and I like that you want to make it open source.
However, I noticed that you licensed the hardware under CC BY-NC 4.0, which is not a open source license. To be specific, the non commercial clause is the main source of conflict, because the term "non-commercial" is vague and can differ in meaning between countries. For example, in Germany a court ruled that if a non-commercial organization shows another persons non-commercial work, that is considered commercial use.
One possible solution would be to choose a different license for the hardware. I suggest choosing one of the CERN Open Hardware licenses. (Wikipedia information, see also)