clamped fwd bottom in place. Drilled and clecoed at the flat areas and clamped edges to pull to fit firewall curve. Drilled and clecoed at firewall curve. Clamped and match drilled thru channel and bottom skin and clecoed in place. Clamped skin to side of lower longeron and finished drilling and cloecoing to channel. Drilled thru lower longeron into skin and clecoed final shape. Marked around the skin for trimming. Will dimple skin and firewall and countersink channel and longerons then flush rivet.
