More about my stacking architecture in this article:
hackster.io/news/the-armachat-nano-racks-up-the-features-by-stacking-up-pcb-pieces
Video presentation:

Main board top/bottom


Optional USB-A host board


Middle board for joystick

Top touch board ST7735

Top touch board ST7789

Middle board for games

Middle board with QWERTY keyboard

Side spacer and layer connector

What is the licence for these .brd files please?