Some updates: the PCB prototype is already being made, just waiting the fab house to send them. Then we'll start developing a basic firmware for it.
While the PCB isn't here, I already started designing the TK78-L, the version of this keyboard with numpad at the left side. In 30 minutes it is 80% ready, I just needed to redo the guidelines and group move the keys. Just need to redo some traces, now. I think it will be possible to use the same firmware on both keyboards, but cases will not be interchangeable.