There are several gussets that help to join the various longerons with the firewall brackets. Tonight I worked on the F-684 gussets that must be trimmed, bent, and fitted between the firewall bracket, the F-713 auxiliary longeron and the WD-603 bracket. Lots of work for a pretty small part, but everything came out pretty good--I was happy with the fit, so I moved on to the lower longerons. These had to be twisted to match the curve of the fuselage, so they went into the vice and I used a padded crescent wrench to twist them to fit. The right side worked out ok, but the left side needed a little more work to fit correctly. I elected to clamp everything and sleep on it before I continued bending. The next step will be to drill for four bolts on each side, so I want this to fit correctly before moving on.