Final drilled holes for 8-32 flat head screws for securing hinge to top cowl mounting boss. Countersunk outer edges of screw holes; one went deep into composite. Coated/filled all four holes with 5 minute epoxy and let cure. Final drilled grommet holes in oil door out to 15/32"; test fit grommets and studs, then removed. Selected correct length rivets for Skybolt flanges and taped in place. Mixed and applied Pro Seal to flange mating areas on underside of top cowl.