The doors were built out of 19 pieces of left-over 2x6 T&G Select Hemlock-Fir decking from the roof/ceiling construction. The pieces were glued (clamped) together, then a 3/4" deep vertical kerf was cut into the back (the side that is not visible in the photos) a few inches from the two vertical edges of the door. The short leg of a 3/4" x 1" steel angle was inserted into the kerf; the 1" leg of the steel angle, laying flat against the wood, had 19 holes at 5.5" spacings, each hole with one screw into each of the 19 pieces of wood. Then the wheeled hardware was bolted to the top (close to the two steel angles, for most strength and durability).