We got our door at The Bargain Barn. They make them from reclaimed wood. We picked one and they made into a dutch door. They even added a little shelf, to cool my pies on. 😉 We put the door up and found the threshold was not level. So we had to take it down and fix it. It’s back up and snugly nestled in a partial cob wall. We level and check the square often as We build. We also wired, screwed and nailed “deadmen” to the door frame and buried them in the cob. Deadmen are branchy branches that anchor the door to the walls.