Wrist pin location in pistons with any degree of sophistication; precisely located, perpendicular, to size, to include snap ring groove spacing (though some use 'buttons'). Most pistons have off-set pin holes, and certainly many are installed with orientation of valve reliefs.
As a 'designer', the pin hole seems a perfect locator for other operations. Of course to do that, starts with fixturing off some other feature, which may be removed by the time machining is done. Likely not a lot of differences between those in the video and normal commercial production, except wide degree of precision and production rates, comparing cast parts.
There's an interesting scene in "World's Fastest Indian", that portrays Burt Munro casting his own; quite sure his methods weren't high level production, but all he could do attaining best possible part.
That his record remains standing (1967!), indicates that little shed was far removed from that in the video. There have been higher top speeds under 1000cc, but one way runs; not backed up by two-way runs. https://www.google.com/search?client...still+stand%3F