While searching for a christmas present I stumbled across this instruction for a beautiful raspberry pie NES lego case. The next day I visted my three cousins and they helped me out with many lego bricks to build a raspberry pie nes case. We didn’t manage to get all correct bricks so we improvised a little bit. I also bought two USB NES controller from amazon. But we switched to the PS3 controller, because they are wireless.
For the OS on the raspberry pie we are using RetroPie.
There is also an image for the ODROID C1 or ODROID C2 board available. Maybe this board is the better choice for some emus because it also has a GPU.