• esp-pmsa contains the main schematics and board drawing
• esp-pmsa/esp-pmsa.pretty contains the board-specific footprints
• esp-pmsa/shapes3D contains the 3D models for parts on the board (and a bunch of extras from my various experiments)

Simply call make in the top-top level directory. The build directory will then contain:

• the main board
• A panelized version of said board
• zipped gerbers for the boards you can directly use for manufacturing
• zipped gerbers and SMT assembly BOM/position files for JLCPCB's SMT assembly service for the single-board version.

Makefile uses Jan Mrázek's KiKit, which I cannot recommend enough, and therefore has to be available on your system.

Jan's jlcparts app was also extremely useful in narrowing down part choices based on what JLCPCB have available.