Snap the motor into the clip in the front, and secure with 2 screws.  Don't tighten them up just yet!

Flip the front over and place the pellet disk on the stepper motor.  Center it and then tighten the motor screws.  It's important that the disk it can spin freely without rubbing on the sides. 

Slide the housing onto the front, taking care not to pinch any wires or damage electronics.  Take especial care with the screen.  There are four "snap fit" connections in each corner that will secure the two parts together when aligned correctly.

Take care that the hopper "feet" end up aligned correctly:

Route the wiring to neatly secure the switch and battery in their holding clips.

Open the back cover and turn FED on and off to confirm that everything is working.