Congrats, its a VERY nice build, well done! I can imagine lots of hours going into those great looking alu parts! I just love the neat looks of an all aluminium build. Very good suggestion by Silyavski, maybe put a little block of wood or plastic to hard stop it just to prevent it running off the rails if required and ditch the lower Z switch.

Sorry, I don't want to stray too far from the topic but since you have first hand experience, whats your opinion of LinuxCNC so far?