Finally did it. Today I drilled F843 to W803 to F890 and F804. The first holes that attach the lower longerons to the firewall and floor to the carry through spar. I rechecked all the measurements and am confident that everything is in alignment and so pulled the trigger litterally on the drill and drilled the 3/16" bolt holes along with all the holes on the perimeter of the floor. Started aligning the F891 side skins on both sides. Next is to check the angle of incidence is correct for the carry through. Then drill the side skins to the underlying structure.
