Both tanks at the same stage of completion.
      The reason you stop here is because you have to install the vent tube hardware and the J channel before installing the last partial rib. You can see the installed J channel in the two pictures below.  I got it all buttered up and Kathy held one end while I slipped it into place without it contacting the skin surface. Then I performed the same steps to rivet it as with the ribs.

      You cut the aluminum tube to length then flare one end and insert it in the newly installed bushings in the ribs. It is already to attach when the last rib goes in place.