Step 1: Day 1: Frame, Heatbed
The heatbed uses a shorted-out length of nichrome wire as the heating element. This has proven unreliable and I'm considering upgrading to a PCB heatbed.
Step 2: Day 2: Extruder, Circuit Board
Step 3: Day 3: Wiring
I highly recommend that you mount the circuit board before you ever cut a wire. It would have made this step a hell of a lot easier.