Thank you! Your video series was actually what finally pushed me to consider doing my own design from scratch. 
Thank you so much for putting those together they are truly helpful.
I’ve built a lot of kits but the whole world of CAD and PCB design is new to me so lots to learn.
However, I have my own custom design ready in Fusion 360 and have 3d printed it and tested it with actual switches (though no wiring). I also have the matrix sketched and ready to go but was planning on hand-soldering a prototype just to make sure I’m on the right path.