Diy Door Replacement . Cut your center panel out of 1/2″ plywood. Diy sliding glass door replacement. Why Interior Door Installation Isn't a DIY Job from www.mainstreamhi.com I show you all the steps i took to replace this sliding glass door. Clamp a scrap board level under the door and or drawer openings to align the bottom edge of the door or drawer faces. Drill pocket holes set for 1/2″ thick material in the top and bottom of the center panel (the sides that will touch the rails).the number of pocket holes will depend on the size of the cabinet door.