Despite being the second board developed, wrapping up the 56 documentation has taken a back seat to the more interesting splayed 52, which developed as a more compact version of the same ideas.
In the meantime, Hillside 56:
- KiCad files are on the _56 branch in this repository
- QMK firmware is on the _hill56 branch in my QMK fork.
It has been in use by me, just not wrapped up nicely for release yet. I have no expectation of it needing substantive changes. But I am likely to do a git rebase as part of my final cleanup and doc files, so any development, beyond a keymap, based off it is at risk of git pain. The branches are named _foo as a hint of being volatile.
To edit a keymap more easily than in a text file, the QMK configurator can be used with the Sofle keyboard selection. They have the same pin layout, so the Solfe keyboard can be used to create keymap layers and generate firmware.