Quantity   Component name
1 × PCB 50mm x 50mm from http://dirtypcbs.com/
2 × 8.2 kΩ resistors Anything around that mark (7.5 - 9.5k) should be fine
6 × 2 pin screw terminals
2 × 3 pin screw terminals
1 × 20 pin FFC connector
1 × 20 pin FFC cable
1 × PS3 Controller I used an old sixaxis with buggered analog sticks
1 × Wire Lots of it, I used 20 AWG
1 × Arcade Joystick
9 × Buttons 6 face buttons, 1 start, 1 select and 1 PS button
4 × LEDs (optional) So you can see which controller ID you've been assigned
1 × Case To hold all the goodies