So you want to build your own arcade cabinet? Adafruit has shared a guide that shows you how to build the world’s smallest MAME Arcade Cabinet with Raspberry Pi. This arcade cabinet stands 67.2mm tall. It has a color OLED display, Raspberry Pi Zero, an audio amplifier, and RetroPie loaded.
As you can see, it is possible to play classic games on this tiny machine. More info is available here.