Here is an idea to get the ball rolling as far as how certain features can fold and lap. As mentioned above automatic awnings could be an easy option for overhead cover/ shade in place of panel type designs. This is crude but hopefully it can inspire your ideas and progress. This is one of many ideas i had when reading your post, although I sketched this one because it’s simple to draw and easily modified to scale ...more or less storage/entertainment by simply moving the interior support posts to gain what is desired . ( the vertical dotted line)
If I were building this for myself I would kick around the idea of a spring roller assist ( like a garage door, or a cable/or electric winch type set up for the main overhead cover. Sorry I can’t be more help on the i
B5086A5C-199F-4160-A8B2-AA0D66774067.jpegmechanical end of things , I’m just a dumb carpenter