The first part of assembly is to create the frame as seen in the image on left.

Pay special attention to how the pieces come together on the corners.

You will screw down through the top pieces into the side pieces. Pre-drill two holes on each side for these attachments. Make sure to keep the boards flush with each other other you make the connections. Use 3" screws for these connections.

On the bottom, you will screw through the sides of the long pieces and into the bottom piece. Again, you will use 3" screws for these connections.