How to Build a Columned Room Divider

Measure the distance between the cabinet and your ceiling and cut the four MDF column panels to fit. Two should be the same width as the lower blocking, and the other two 1½ inches wider to capture the edges of the first two. Clamp the base of one of the panels to the blocking, then clamp a 4-foot level to its face. Plumb the panel, then mark where its inside face meets the ceiling, as shown.