-firewall template made from cardboard-template transferred to .016 sheet stainless steel-firewall cut out, edges deburred-slots for nose gear strut mount cut with rotary grinder-edges deburred -firewall checked for fit and trimmed as required-firwall mounting flanges cut from 4 strips of .016 stainless-flanges drilled, notched 60 degrees and tabs bent 90 degrees-flanges clamped to fuselage shell
