Most airframes then and now are largely made with shaped ali sheet riveted to other bits of shaped ali. 50% of the VC 10s airframe was machined from solid billet. Also it was mostly "Fly-by-wire" as used on Concorde then 30 years later on the Boeing 777, the world's (ahem!) "first" fly-by-wire plane! The RR Conways were superb engines in their time, effectively Olympus engines but without after-burner, but sadly they are now too noisy, polluting and thirsty for service. The VC 10's sophisticated aerodynamics were designed around the Conways, and the test flew one with a more modern RB 211 one one side instead of Conways. It looks extremely odd, FAR bigger! The RAF reckon the airframes are good for another 20 years.
I remember walking up the stairs to the cabin door which was right in front of the two Port engines, it felt like you caould almost reach out and touch them, and for a boy this was so exciting.