Watched the entire thing. Just look at all that machining...
Not just a lot of machining, but very large machining, which is worlds apart from the kind of machining most of us do here. Think about multi-hundred ton overhead cranes just to bring the part to your lathe or mill, then think of chucking it up, fixturizing it or tramming it in to proper position.
Machining on this scale is a whole different deal!