4.5 hrs
Started out fine tuning the thickness of the 904 spar spacers.
Fit 904A to center section.
Final dril 904A flange/976 skin.
Fit 904H parts and match drill.
Match drill 915 ribs.
Countersink 976 skin/904 flanges. Decided to countersink all of the holes. The FAQ from Van's builders help section said "it would be fine". I didn't like the idea of dimpling the 904 flanges, even though they're only .040. The countersinks do go just a fraction into the spar flange, but this procedure leaves the inside nice and smooth.
Remove 976 skin.
Final drill all 905 rib holes.
Remove baggage ribs.
