The first order of the day was to dimple the firewall. Next, with all angle pieces and all aluminum contacting the stainless steel firewall primed I reassembled the firewall with all angle, stiffeners, spacers, gussets and welments, then proceeded to rivet it all together. I elected to back rivet most of it since it is fluch rivets on a flat surface. This seemed to work pretty well, theough I did tighten up a few rivets using the mushroom set and bucking bar. There were a few rivets that required the flush set and bucking bar as well. The recess remains clecoed only and will not be riveted until much later in the construction process. The hole on the firewall removing it provides important access into the front of the cockpit.
