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The first two pictures show another issue I had with the lowered seat mods as outlined by Sonex.  There is a piece called a hook mount that will support one end of a bungee that attaches to the control stick.  If you build it per plans it seems that the bungee would be blocked from a direct path to the control stick because the seat sling will descend below the hinge.  I turned it around.

      The next sequence of pictures just show the installation of all the channel stock and gussets that make up the lower cabin details between the spar tunnel and the rear of the seat. The first and second pictures show the finished installation from the inside and the outside. The rest of the pictures are at various stages of completion. You can use the first picture to help see the location of all the pieces shown below.