I`ve made PCB for arduino controller + 5Pcs CD4021 shift registers (40 buttons) + 4 analogue axis controls + ws2812 leds + 2 simple leds. http://i.imgur.com/593a7mC.jpg If you need it, here you can take gerber files, ready to be printed on PCB fabric. Link for gerber format files. http://renderg.ru/rgcustom/rgcustom.zip PCB design is fully compatible with mmjoy2. EDIT: Got few available pcs in stock.