For this I am using a Raspberry Pi Zero, a slightly older generation without the built in wifi. The headers have been soldered to the zero and scroll phat. Not the best job in the world but it will do. Due to the fact that the Pi Zero only has two usb ports, 1 for power and the other will have to switch between keyboard and Wifi Dongle. So getting this headless as fast as possible is key.
Scroll Phat HD is available from those pirates over at Pimoroni