I’m adding return fuel lines for electronic ignition (SDS EFI) so I decided to drill the extra holes before deburring the side skins.
I drilled the additional 7/16″ holes for the AN bulkhead elbows that will be used for the supply lines (per the installation guide from Aircraft Specialty).
I then removed the skins and removed the vinyl along the rivet lines.
I then started deburring the holes and edges.
Two skins done, two skins to go.