Masterpiece my foot, they no more making masterpieces than Apple is. They're a well oiled human machines applying a well worn process, with well trained technicians and attention to quality and detail, no question, but that's it.
And no doubt the finish is fantastic, just like it would fantastic if each workers in any the factory spend a whole day polishing an object or any of its parts.
They're not machining those parts by hand, because its pointless and less precise to do it. And even if did crappier hand machine parts (because humans don't work at nanometer level), I wouldn't care either. Unless you think using a modern machine and entering the info from a cad station is "machining by hand"... In this case I guess they would do it "by hand" (sic).
Anyway. I don't care. This is a dying technology, within 10-15 years, they'll mostly be out of a job and on the street except for the few people in the world that cares that the exact same internals were worked on by humans for 2 days, instead of by a few robots working for 30 minutes. That's why 99.9% of people buy factory built cars and not hand formed and assembled ones.