Finished drilling out all frame and skin holes (note, bottom skin to spar holes are #30 for the CS4-4 blind rivets). All holes deburred, then skin dimpled, all frame parts that needed dimpling were done. The rear trim spar was countersunk on top for flush rivets to give clearance for the piano hinge. While this material calipered at .032 and is the bare minimum thickness to countersink, it work out well. Parts primed.
