Step 1: Cut MDF Panel. Using the table saw, cut one of the MDF panels down to a couple inches larger than the finished door will be.
Step 2: Cut MDF slats. To save some money, you can rip larger MDF sheets down to 4 inches wide using the table saw. Alternatively, you could buy 4 inch wide MDF trim that is already cut down (but it’s a little more expensive)
Step 3: Prime everything. Apply primer on all sides of MDF (all of the cut slats and sheet) with a 4-inch roller. Let dry throughly.
Step 4: Find center. Measure the center of both the vertical and horizontal edges of the MDF sheet and draw two straight lines with level and pencil in the middle.