No I'm talking smaller..... My Neo has a 15" screen and regulat controlls. The box physically doesn't move when you play the games... But I'm thinking of going smaller, but I don't want to go so small that I have to use non-arcade hardware or be so small that the whole machine would be moving around while you play it, ya know something like this:

I want to make the smallest machine possible while still using real arcade joysticks but I don't wand the size of the machine to keep someone from going after a kill screen in Donkey Kong. So what's the smallest, but fully playable machine that you have used?