YES! Someone else likes missile launch covers! GO @Randy!
One cannot turn things on or off when the cover is down, can turn things on or off when the cover is up and if one slaps the cover, the thing turns off.
I was going to make the same suggestion. A few years back I designed and built a modulator (a controller) that digitally modulated a Tesla coil. No matter how careful one is, how well a barrier is set up and how much one warns, someone always wants to approach.
The primary is running 320 VDC@500A. The secondary is pumping out 500KV - 4 ft bolts. One arc and a person can be killed or go into cardiac arrest.
I needed a way to kill things without thinking and used the very cover (and toggle) that @Randy is pointing to.
A friend of mine who is building a CNC machine brought out a remote E-Stop.