That's really interesting information Nic, thanks.
On a slightly related note, I was given an enormous red with a white lining Arthur Percy Gullaskruf style flask (over 3 feet tall), and have recently discovered a cable hole in it, towards the base. It is properly cut - round with not much chipping around the edges.
Studying it makes me suspect it was professionally done, not a home bungle.
Do you know, or suspect if it might have been one of these companies you mention were also lamping other suitable items?