@GMarc Is that an RC servo for the Z or a stepper?
If it's a servo you'll need to use the Eleks firmware from the custom menu and configure it for EleksLaser + Servo from the menu. It works like a laser, where the PWM controls the servo so not really a Z-axis.
If it's a stepper you just enable CNC mode and it works like a Z-axis.
I am about to fit 'Home' switches to my 650 x 500 laser engraver machine. I cannot source long cables to make full use of the available area on this machine so I will have to make up my own, I think this is fairly simple to do ??
All the rest of the components are fairly standard