This photo shows the completed ribs which go between the false spar and the rear spar. These ribs are not flanged as the drawings states to flange only the ribs made from the .025" material.

Here I began to fabricate the four ribs which go between the false spar (behind the fuel tanks) and the aft spar.  I used the form blocks depicted above for consistency throughout all of the center rib fabrication.

false spar ribs