Quantity   Component name
1 × Raspberry Pi 2B or 3B [£33.984]
1 × 8GB SD card [£7.50] For the Raspberry Pi
1 × Raspberry Pi 7" Touchscreen [£57.588] The official one.
1 × USB Soundcard (Startech ICUSBAUDIO2D) [£28.128]
1 × eXaDrums PCB https://oshpark.com/shared_projects/xdNJqH9u