In version C, the IDC connector had to be mounted to bottom of PCB (I screwed up the orientation)...It work perfectly but I would prefer all components on the same side (aesthetic/logical), so to Version D...

The new board is in production over at PCBWay, once complete I will run some tests and if everything goes well, I will have three to give away...

As to a keyboard, you can use my Basic Keyboard design (hand assembled, just need PCB and parts), or you can design your own, be it a keypad, macro pad or full sized keyboard... 

The important point is you don't have to design the logic, just use the Keyboard Module and you are QMK/VIA ready.

See my git for example code here: EN14

Mike