Simple….in WW2, production had been honed in Hawkers to producing tubular framed aircraft. Hind, hart, fury etc. The strength was in the tubing which in itself was complex but standard. Shape came from wooden formers covered in fabric. Similarly, the wing spars were complex rolled polygons. So they were tooled up to do this for the hurricane.
On the other hand, Spitfire were at the time relatively new processes semi monocoque and required a degree of new practices and tooling for Supermarine, who had been building traditional and mostly wood seaplanes. The early spits show RR like handbuilding.
Fast fwd to the 80s. Production methods are very much geared to Spitfire tooling. Whilst, Hawker tooling died with the Hurricane. The polygon machines, the tube squaring machines have all but one or two long gone. To a certain degree, the metal available has changed needing replacements or new batches.
Hurricanes were built using state of the art methods and tooling in the 1930s, long since obsolete. Spitfires were new methods.
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