Bell Briar - Ortholinear 5x12

[Turbinia]

*pictures don't seem to be loading, will have to figure that out later. Included one as attachment.

I am sure I am reinventing the wheel a bit here, but wanted a new project. So here is my take on a 5x12 ortholinear. I like the Preonic, but it does not support the split spacebar style I wanted. Determined through testing the layout with keycaps that for gaming I wanted a 2 unit space bar off center. The board with support full matrix, two/split space bar, single centered or off center. I have done PCB layouts for a Teensy 2.0/3.x/LC and smd atmega32u4, probably going the smd route as I can do a low profile case with that.

I will post the schematic latter. Would appreciate if someone looked over the QMK layout and let me know if that all makes sense, though probably easier to troubleshoot when I have a board.

For the firmware I think I have something that will work. There is a set of arrow keys right on the home row left hand and a number pad for the right. Have a layer with lowercase greek letters and math symbols that can be shifted to an upper case greek layer. I do a lot of technical documentation where that will come in handy. Easy switching between Colemak and QWERTY, muscle memory for some CAD applications is still in QWERTY.
QMK Firmware:
http://www.sinphi.com/projects/keyboard/bellbriar.zip

images not loading so links here
http://www.sinphi.com/projects/keyboard/BellBriar_013.png
http://www.sinphi.com/projects/keyboard/BellBriar_014.png
http://www.sinphi.com/projects/keyboard/BellBriar_015.png
http://www.sinphi.com/projects/keyboard/BellBriar_016.png

[Phenix]

Looks good! But wouldn’t using POS caps for the 2u be easier??
Nevertheless, your variant is more elephant..

[Turbinia]

Bit of a delay, but here are is the schematic and KiCAD files for the atmega32u4 version of the board. I don't think the teensy version is really needed. It requires a higher profile case and isn't as elegant. If you can solder switches and 0805 diodes, you can drag solder a TQFP package. All made available as CC BY-NC-SA 4.0.

The holes in the PCB are 2.7mm by 3.2mm slots, so should fit M2.5 or M2 hardware. Planning on M2 for the fit with my plate.

schematic:
www.sinphi.com/projects/keyboard/atmegaTwelveByFive.pdf

KiCAD files:
www.sinphi.com/projects/keyboard/atmegaTwelveByFive.zip

[Nitrax]

Have a layer with lowercase greek letters and math symbols

I know this is an old build log, but I'm curious how that layer worked out for your technical documentation. Did you use it to insert Unicode characters directly, or to enter commands for an equation editor?

I'm working on math input tools myself, so I'd be interested to hear which symbols ended up being the most useful.