Grab the yellow motors and back half chassis. Use four M3x25 screws and four M3 nuts to assemble the two motors as shown in the diagram below. When installing the motors onto the chassis, make sure that the red and black wires are facing the inside, like this:
This makes it a lot easier for future steps. Once you finish this part, place your assembly to the side.
Note: If your upper plate does NOT have raised tabs (see next section) and instead is completely flat, continue with these directions to complete your motor section: Insert four M3x25 copper standoffs through the acrylic plate into four M3 nuts as indicated in the photo.