Tonight I finished all the structural components of the firewall. Plenty of parts to trim and back drill. These included the firewall bottom stiffener, firewall top stiffener, the "L" angle across the top of that part, the firewall side stiffeners, the rear firewall reinforcement, the rear "L" angle supports, and the two "L" angles for the back side. Things came out just great, so I'll be wrapping up the little stuff on the firewall tomorrow.