I have one question, what size indicator do you use on those machines(seriously, what is the accuracy)? As far as current machines in the US I did some work I on a building about 20 years ago that was going to house a mill that would produce fans for large jet engines. The footing for the table went down ove 20 feet into the earth. When they were testing they would pick up vibrations from traffic passing by 100' away. The table was going to be about 25' in diameter. I do not remember the tolerance of the finished machine but is was crazy given the size.