Today I did the final fore/aft positioning of firewall and drilled it to the side skins. As I said yesterday, I set the forward face of the firewall 5/8" behind the forward edge of the side skins at the top, and put the centerline of the firewall bottom angle in the second row of holes across the forward edge of the bottom skin. This put the forward face of the firewall 11/16 aft of the forward edge of the bottom skin.