There are some kicad projects of a PCB with some I/O but mostly headers. Caution: I am not an electronic engineer, check schematics and PCB before using it !
Dev. board with headers.
Zipped gerber file is available: Gerber file
Dev. board with hub75 connector. Caution, there is no level translator (3.3v -> 5V), so it may not work with some leds matrix because of they work on 5V logic level.
There are two jumpers to wire D and E signal in case of 1/16 and 1/32 panels.
Zipped gerber file is available: Gerber file
