Flutted landing gear bulkheads. Smoothed and deburred edges of all parts. Clecoed L & R landing gear box assemblies. Match drilled all holes. Countersunk all nutplate holes and L & R hidden rivets behind mid-cabin braces. Countersunk #30 holes on forward R landing gear box. Disassembled and deburred R landing gear box. Drilled and countersunk throttle quadrant bracket. Countersunk mid cabin braces for nutplates.