Plans: 1. Complete inspection hatch installation. Status: Complete. Both doors were installed successfully. I had a little mishap along the way. Somehow I managed to put the backing plate on the outside of the panel on the first attempt. I had to drill out all the rivets and clean the surfaces to perform a do-over. After installing I saw that the rivets along the latch line contact the airframe. I will add a rubber spacer over the rivet line to fix the problem later.