I'm not sure this is really comparable to a NST powered Jacobs ladder or Tesla coil. A MOT has much more bite behind it than a NST, and the end goal of a Tesla coil or Jacobs ladder is usually to watch from a distance in time limited demonstrations, sitting on a shelf in a harmless state most of the time. Not manually poking the output of a roughly 2kV, .5A 50/60Hz power supply into a puddle of salt water.