Installed the Gussets on the firewall and F843 lower longeron. I did not remove the skin F898 PP so the work was a little more difficult because I had to do all the drilling from under and inside the fuselage. The thinking here is currently the fuselage is in the final position being clamped and cleacoed. So drilling in this condition should insure alignment after I take the fuselage apart for deburing and priming. Also Worked on the bagage compartment components to insure they fit. Given I had to shim the F802R L&R bulk heads. So far so good all the components are fitting tight to the skin.