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https://lewisf.com/dactyl-manuform/ hold ; and use hjkl to left,right, up,down
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Both part needs to have ProMicro MicroController so It can use the QMK Firmware for controling the keys on keyboard itself
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4x6 is the way to go
There’s a strong trend for ergonomic keyboards to reduce the number of keys, mostly becouse of QMK framework that allows layering. People usually prefer less rows.
You need to consider Sterm, tactility, Acctuation force.
Idealy you want to the same sterm, lighter acctuation force on pinky, somwhat harder on the other fingers.
This guy also have shop, very detaild guide. https://www.beekeeb.com/dactyl-manuform-mini-mechanical-keyboard-build-log/
With trackball, he bought 3d printer to print the thing https://medium.com/@kincade/track-beast-build-log-a-trackball-dactyl-manuform-19eaa0880222
- Ender 3 Pro upgraded with the SKR Mini E3 board
http://blog.pzs.me/posts/dactyl-manuform-log/ gave really good insigt about multiple variables you need to generate body, he used http://dactyl.siskam.link/
PCB is not something you can buy for this keyboard, people usually hand solider them which sucks big time, and you can't change your switches. This is the reason you want to usehot swap sockets so your matrix look like this. And solidering video
Its good to consider holder for Mx Charry https://www.thingiverse.com/thing:3117549
https://www.keymouse.com/catalog/keymouse/keymouse-track-125-3d-printed-assembled