This RaspBerry GPIO Port Expansion PCB will allow you to easily install your GPIO cabling.
It has a joysticks / buttons installation legend that corresponds to the wiring diagram of the RecalBox distribution.
The Pi power board PCB allows you:
To supply a Raspberry in 12V with a JACK connector.
Cool your Raspberry with a 4cm diameter fan.
To use the power and reset buttons of the RecalBox distribution.
To simplify the wiring diagram of the button joysticks installed on the GPIO.