Using the provided short screws, loosely attach corner brackets to either the side pieces or the front and back pieces.
Attach remaining side pieces or the front and back pieces. Snug all screws. The top and bottom plates fit very snugly so the sides may need slight adjustments for a perfect fit. Small adjustments can be made by loosening the corners and pushing in or out on the faces. Retightening the corners will hold the pieces in place.
Attach top, bottom, or corner plates as appropriate.
Note on Corner brackets
These hold the enclosure together. The threads in these brackets were made with a forming tap and, as a result, work best if the screws are inserted from the same side as the tap was. If you look closely at the bracket, one side of the screw hole has a raised lip and one side does not. During assembly, insert the screws into the side that has the raised lip. This is not essential, but makes screw insertion a bit smoother.