I prepped up the top tailcone skin -- deburring the edges and all the holes as well as the slot in the aft portion. Fortunately -- not to mention: curiously -- all the holes in this particular sheet accepted LP4-3 rivets, unlike other skins in my kit so I didn't have to drill them out to full size.
After fitting the top skin, I match drilled the two holes on the angle of the aft bulkhead -- 1210, I think is the number -- and drilled out the holes that were already in place using a reamer.
Then I shot primer on the rivet lines and let it sit. I have to go to the car show to look at replacements for the 15-year-old Subaru.