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Thought I'd post a pic of my recently rebuilt Elite as an example of what a mismatch of drivetrain components you can not only get away with, but achieve superb, almost lossless efficiency.
FSA MegaExo bottom bracket with ceramic bearings from Ceramic Speed
Dura Ace triple crank
48T FSA big ring
Campag Race Triple front dérailleur
Shimano XTR 11-32 9-speed cassette
Ultegra triple rear dérailleur with ceramic bearings - Ceramic Speed again
Dura Ace 9-speed gear shifters
Most of these choices are by design, but one or two a result of what I happened to have. As you can guess from the gearing, this is a flyweight tourer (I don't race).
Love the green Ben. Very nice looking ride indeed.