build_guides VS qmk_firmware

Maybe read https://github.com/keyhive/build_guides/blob/master/docs/keyboards/sofle-rgb.md including the issues and pull request 10 https://github.com/keyhive/build_guides/pull/10 which has an update to the firmware instructions.

here is the build guide for v2.

Here's a couple of guides, they may not be applicable to the exact version you have.

They also have a build guide: https://github.com/keyhive/build_guides/blob/master/docs/keyboards/milk_v2.md

I was worried that the order might impact on ease and access for soldering, so was following the official foostan order of attaching things (diodes, leds, jack/oled socket, switch sockets) but given the good advice and discovering this guys build guide seems I can do the LEDs last and, thus, test as I go.

I dont know about a helix guide specifically, but I followed this one for the lily58, which is super similar (as you probably know) https://github.com/keyhive/build_guides/blob/master/docs/keyboards/lily58pro.md

Also make sure you have jumpered the pads for the oleds, I see that missed or bridged semi-commonly. https://github.com/keyhive/build_guides/blob/master/lily58pro.md#attach-the-oled

I only use keyboards running QMK or ZMK, so:

My Caps Lock key is a Control/Escape key (when tapped it behave like a Escape, when hold it's Control), and my left Control is a one shot layer switch key [1], which means I tap LCtrl once, and then press Caps Lock + 5 to get Ctrl+F5. Doable with single hand and more ergonomic as I have an unusually small hand.

[1] https://github.com/qmk/qmk_firmware/blob/master/docs/one_sho...

I agree that reduced finger movement is a crucial step in achieving typing efficiency. This is nicely solved by mod tap modifiers in QMK/ZMK[1] where key acts as a char when tapped and as a layer while pressed.

[1]: https://github.com/qmk/qmk_firmware/blob/master/docs/mod_tap...

Separate wireless controller, see the glue code at [0]

[0]: https://github.com/qmk/qmk_firmware/compare/master...nuphy-s...

If you have a keyboard that runs QMK firmware[0] with the VIA[1] feature enabled[2], then there is a convenient testing app available from the same place you customize your keys [3].

[0] https://qmk.fm/

I made a layout that I'm happy with. Spanish is my native language, so it has characters like the accents and 'ñ', but it's meant to be used for programming as well. Visual Studio uses a lot of Ctrl and Ctrl + Shift shortcuts, so I left them in the same place as the default Corne layout so I can press them both with my pinkie finger. Perhaps some of the ideas are useful to you.

Also, it would be possible to do this for the RP2040. However, it needs some work to get working. but for example: https://github.com/qmk/qmk_firmware/pull/20999

Ok, it's an ST7735, not too different from the ST7789. You should be able to get running by looking at their files in the QMK repo and going from there. You should also check their resources page.