Thanks Peter - that is exactly what I was looking for. I had seen that posting a while ago, but my search didn't bring it up.
Our project is delayed as the hatch we ordered is the wrong size for what we need to get through the opening. It was a custom order, but not made the way we wished. So we will have to arrange to reorder and wait for the hatch again before we get to it.
In the meantime, we are off to the Prairie Egg Gathering on Thursday! Can't wait!