One Switch To Find Them All, 

And In The Darkness Light Them.

One thing I did not compromise on at all, was the electricity feeds here.  I called in a properly certified electrician, told him what I wanted -- lots of power points, drive these here machines correctly, huge LED shop lights -- and said build the whole thing to code.

One nice little result of doing it properly, is the breaker next to the door.  Shuts *everything* off.

I remember when very young I had a very cheap arc welder that I ran on 110V in my dad's garage in California.  My arc sputtered and died, and the plug on the wall started throwing a rather large arc.  Did not blow fuses.  I took a chunk of wood and beat the plug out of the socket to kill the arc.

Now I know I'm way too smart to make that sort of mistake again, but because it happened once, I'm really rather glad I've got that whole-of-shop breaker where I can reach it easily -- and on the way out!

Message: Don't bet your house -- use a properly qualified tradesman to do your infrastructure.