Thanks, yes it is a cool build.
The house belongs to the in-laws. They built it back in 1977 and the flat roof had been replaced three times, so this time they inclosed it to make a new room. A 1,600 sq ft room.
The flat roof was originally designed to square dance on, but I don't think they ever did for fear of making it leak, which it did anyway.
New floor trusses, 2x6 walls, closed cell foam insulation and pine car siding. We have a big family and it will be well used during parties.