WOW -
I read this by chance.
I'm surprised that communication happen yet.
Thank you very much for your interest. !!!
If you have any questions, please tell me in the comments.
I'll answer as much as I can.
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During the production of SAB-CP,
In order not to reproduce the hard work that had to be done unintentionally,
I'm developing our own PCB (with QMK).