This morning I primed the strobe light backing plates & the small inboard wing skin then installed ribs 4,5,6 & 7. The rib flanges needed adjusting to bring them to the same level of the spars. The support angles for the flap brackets all need "joggling" as per the manual to allow the rib to sit properly against the rear spar, that takes quite a bit of time. I've installed the aileron bellcrank & flap hinge bracket to rib 8 but it too needs the support bracket joggled to allow a better fit. I'll do that tomorrow. A trial fit of the bottom inboard skin shows that some minor work needs to be done on the ribs to get a better fit and I've discovered rib 5 has 2 holes missing in the bottom flange, otherwise it's coming along nicely.