One of my Scout Leaders, back in the sixties, was involved in (I think) programming the milling machines that milled Concorde wing panels from solid alloy billets. Dural I assume, I didn't think there was much Titanium in Concorde?
How much of the Lady's structure was machined from the solid like this? In one sense, it seems extremely wasteful, but in another it is the most perfect way of "knocking off everything that doesn't look like a wing panel." To paraphrase someone.
Roger.