2 layers

ATmega32U4-breakout board
Sn3cor/ATmega32U4-USB-C-breakout-board
Arduino Pro Micro like ATmega32U4 USB-C breakout board
22 parts
Open-source boards designed in KiCad by Sn3cor on GitHub, from 2 repositories. A board’s address here is its repository’s there.

Sn3cor/ATmega32U4-USB-C-breakout-board
Arduino Pro Micro like ATmega32U4 USB-C breakout board

Sn3cor/wyse-mod
Wyse Keyboard converter from 4P4C to USB, compatilble with Soarer's firmware