The ultimate arcade accessory - Who said the iPad was only for reading?

I have fallen in love instantly with this one. We saw something similar for April's fool (the iCade) but this is the first homebrew working model I see. I'm not completely sure what's going on there, I get too distracted with the dogs and the Google Translate result is not so good, but it seems hm0429 is using a Arduino classic joystick connected over the iPad over Wi-Fi.

So, who wants to build one with me?