Pocket Universe writes –
“Well, this is pretty much exactly what it sounds like. I’ve torn apart a wired 360 controller, put the guts in a pretty box and soldered some arcade buttons and a joystick to it. Thought I’d publish this to give you all an idea of how it can be done and just for general inspiration.
The name, Gyokusho is actually stolen from a japanese chess variant called Shogi. The equivalent of the king is called the Gyokusho or “Jade general”. The short hand for that is the sign you can see in the middle of the controller (see image below).
Oh, and by the way, it’s huge.” – Link.