Green Knight,
thank you for another very interesting post. If the 'E' and the 'H' had different material in the wing it begs the question of what the RAF 'K' was constructed from ! As a mere loadmaster I became interested in the a/c structure and the corrosion problems when, as was my habit on route, I read about it in the relevant AP in the a/c library. I had not known till then of the variety of alloy used in the C130 structure.
The SNCO i/c the Structures Bay very kindly indulged my curiosity and showed my some rather alarming bits of mouldy a/c and the constant battle with the problem. Many other a/c will have no doubt suffered at one time or another as the battle of weight versus strength was fought out in the design offices.