Continued working on fitting the cowling:

1. Drilled out the keeper rivets at the bottom right side of the firewall.
2. Clamped the right-side rounded seam-filler piece into position.
3. Clamped the two bottom right Skybolt plates into position.
4. Drilled, deburred, clecoed and riveted the seam-filler pieces and Skybolt plates on the right side.

Hinges:
5. Repositioned both side hinges to have a slight reveal forward of the fuselage skin.
6. Match-drilled the hinges to the fuselage & firewall skins.
7. Removed the hinges, countersunk the back sides to match the pre-dimpled firewall flanges.
8. Clecoed and riveted the hinges to the airplane.
9. Installed the other half of each hinge and checked their fit.

Top firewall Skybolt fasteners:
10. Sanded and Dremeled all the high spots off the inside 4" of the upper cowl, to allow for the best fit against the Skybolt flanges.
11. Placed the upper cowl into position and clecoed & taped it. Drilled and filed out each attach hole to their full size (15/32"). This was extremely tedious, because the alignment of each hole had to be checked numerous times from inside using a flashlight and a mirror, or from the outside white holding a flashlight in position behind it. Sometimes the initial alignment holes were "off" enough that I had to manually file the hole with a needle file until I could get a larger round file in the holes, then open them up to roughly the center of the mounting flange, then finally use a Unibit to make each hole precise.
12. Snapped Skybolt rings into each hole. Added the fastener assemblies and the temporary rubber grommets to hold them in.
13. Clecoed all 15 fastener bases to the flanges on the firewall.
14. Began riveting them. (Got about 1/3 of them done tonight.)