Didn't mean to start a todo just wanted inside.  Seems to me that the process should go...1.perimeter, 2. heat gun the center, 3.  seal the covering to the ribs.  The last step locks everything in place.  Not sure but gaining insight.  Would be nice to run into an oak tree and knock it over rather than have to climb the tree.  Sensi, I think you have enough lift with the ailrons to get the dining room table aloft.