"Origami" CNC Plasma Build - folding 1200 x 600mm cut area

If the part the acme screw nut is bolted to was a piece of angle iron, it would be an ideal spot for a switch with minimal wire flex...

Updated with some firther thinking.
[1] adjustable stop for Z float
[2] Z top home proximity sensor.  I might need to change this to a roller switch once I try and mount the nema17. We shall see.
 

J.

 
Notice the switch, it can not be pressed by any plate.
As you have it in the last picture, i can foresee a lot of broken switches in your near future!

But to get smashed switches doesnt that mean a lot of Z axis crashes? If so how?  That would feel to be the sign of some kind of problem?

No problem, user error, namely while setting up the machine and it rams at full speed on the material, or sensor not wired to the input you thought it was, or jogging down while holding shift key ( PlasmaC does not react to float switch while jogging, it should ), etc.
Or after cutting some plates you find a nice design for some lights made out of square tube and forget to raise the probe height, this happened to me several times...

QtPlasmaC "shouldn't" jog if breakaway, float, or ohmic are tripped.