Yasui is a pro micro based 4×10 ortholinear keyboard. PCB supports MX switches and an RGB strip. Numerous bottom row options are supported allowing for a layout that works for anyone. V2 (this one!) also has official VIA firmware and support, as well as VIAL firmware. VIAL hex can be foundhere.
Included in this kit is a PCB, switch plate, bottom plate, mounting hardware, bumpons, reset switch, and diodes.
To complete this you will need a pro micro controller (or compatible replacement) and any applicable stabs for your chosen layout. You’ll need up to 40 switches and appropriate keycaps.
Firmware can be found in QMK master. Yasui supports VIA as well.