This picture is been a around for a while. Somewhere I have about 16 photos of that one showing how it was set up. The middle section of it goes inside the hole camper when it is in the down position. I think that one will be hard to seal. Lots of water will hit the side on the top section and have no place to go but in.
Now if you have a TD that had a pop up section that covered the camper you have a better chance to keep water out.
Check out what I planing to build.
Max Headroom, A Pop-Up Benroy, planning
viewtopic.php?f=27&t=53506Here is a great link to campers that have a pop up section in them or lifting roofs. These are all the ones that were finished buy forums members and other camper on the net. Sharon “S. Heisley” put these links together.
Teardrops & Tiny Travel Trailers with Lifting Roofs
viewtopic.php?f=5&t=50969In the design area you will find many great and strange ideas that are just idea. Waiting for the right day and build to come along.