Some more pics and firmware....

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I finally got around to write some code. Here you can find it. In short it can be used as a standard numpad, pressing the key where you usually find the NumLock toggles the Navigation layer which enables the nav cluster.
I also added a layer that controls the RGB backlight.

The OLED screen display information about the layer status, the NumLock, ScrollLock and CapsLock status and RGB settings... But I want to add something more in the future.

All of this obviously was made possibile by the awesome work of the QMK community.

While I was at it I also took some more pics, enjoy...