That's fascinating Engines.
Here I was thinking that air-frames were a thing of Swiss-Watch precision, otherwise they'd lose structural integrity.
Had always thought that they were a bit like origami in aluminium, strength deriving from careful shaping, uniform torquing of fastenings etc.
By contrast - I remember the chap who rebuilt the Mossie fuse in Auckland telling me that it was possible to achieve very high degrees of accuracy in wood, which I always thought was pretty amazing considering you were lofting from drawings by hand, and wrapping wet ply and balsa around concrete moulds.