Dutch Door Diy . The bottom door would have two hinges so i just needed to add an additional hinge on top. Next, frame the plywood with the 1×3″ pieces. How to Build Wooden Dutch Door Free Dutch Door Plans from www.barntoolbox.com Once you have the measurements needed for the door, rip the plywood down to size using a table saw or circular saw. We decided to cut our door at 40″ because of where the old door knob used to sit. Next, measure, mark and cut ledge, mitering two corners at a 45 degree angle.