Stiffeners have been match drilled to the skin, all the holes got deburred and dimpled. Only some sanding to do before priming.
At the end, beginning of the preparation of the trim tab reinforcing plate.
Just for fun we counted the number of holes that fix the stiffeners to the skin. There are 280, that means 560 holes in total (stiffeners + skin) that have to be drilled, deburred on both sides and then dimpled