Today I spent a couple of hours upsizing the holes from 40 to 30 and installing copper clecos. There are some hard to reach places on the inside formers particularly the first pilot drill holes. Once they were done the larger hole drilling was ok.
I need to now take out each former and mark out the centre lines to be able to drill the holes fro outside the fuselage and then the prepainting prearation and painting and then reassekbling and rivetting is required.