First attach the two encoders to the two Motor Mount as shown below using four 4-40 bolts and four spacers. Note the position of the spacers, two of which are visible in the image below. The other two spacers go behind the encoder where the other two screws are.
Now attach these two Motor Mounts to the underside of the Chassis using four 8-32 bolts as shown:
Next attach the two Motors to the Motor Mount using four 4-40 bolts as shown below. The Shaft Adaptor should be used to connect the motor to the Encoder.
Now mount the Swivel Wheel to the underside of the Chassis using the Swivel Wheel Mount as shown:
Next attach the Raspberry Pi Mount to the top of the Chassis as shown:
Then attach the Motor Controller Mount to the top of the Chassis as shown:
Now mount the IRSensor Mount to the bottom of the Chassis using two 8-32 bolts as shown:
Next attach the Battery Mount to the top of the Chassis using two 8-32 bolts as shown:
Now attach the Raspberry Pi to the Raspberry Pi Mount using four 4-32 sheet metal screws as shown:
Now attach the Arduino Mount to the Raspberry Pi Mount using two 4-32 sheet metal screws as shown:
Then attach the Arduino Board to the Arduino Mount using three 4-32 sheet metal screws and three Spacers as shown:
Next attach the Motor Controller to the Motor Controller Mount using two 4-32 sheet metal screws as shown:
Finally mount the two IR Sensors to the IR Sensor Mount using two 4-32 sheet metal screws as shown: