Construction of Tubular Steel Fuselages is written to assist the average mechanic or aircraft builder to produce a tubular steel airframe that is as good as one from the factory. The assembly methods in this manual are intended to produce a highly accurate fuselage in such a way that expansion and contraction occur symmetrically with no distortion. The techniques given including those on jigging and alignment methods will also help in rapid prototyping where a high degree of accuracy is necessary without elaborate welding jigs.