Num13 is a 45-key compact ortholinear mechanical keyboard which includes a Numpad and is 13Ux4U in size, which I designed for my own personal use.
The build is composed of 2 PCBs, the top pcb includes the key matrix (MX switches or low-profile Redragon switches w/ plate stabs), while the bottom includes the keyboard controller (a pi pico), a status led (rgb on the rB revision included here), and serves as the base of the keyboard structure itself.