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At this point I had all the inside pieces attached and also had fitted the upper firewall so I tried on the engine mount again just for fun.  Then it was back to work drilling out all the remaining holes to final size.  I started with the firewall.

      Then I did all the holes in the floor starting with the stiffener, then the spar tunnel and finished with the longerons.

      Note there are still some silver clecos. I have not updrilled the splice plates and the two groups of seven silver clecos get drilled to a gusset plate added on the next plan page.