I decided to work on the W-1201-R Inbd Wing Skin today. Dimpled the 2 holes per the plans and then deburred the edges. I tried my multifunction tool with a wedge-shaped sander attached but still had to file the edges and finish with a Scotch-Brite pad. Primed the inside surface of the skin. Once the primer was dry, clecoed the skin to the wing skeleton. I'll rivet it tomorrow.