I think you should turn your spindle ram block upside down to gain more useful z-axis travel. Because now, after putting a vise and a tool in the spindle, you’re left with maybe 150mm travel and a bunch of dead space. Also, those inductive prox sensors may trip and ruin your work piece if you have metal chips flying around.
Very nice machine! Did you fill the frame with concrete, epoxy concrete or sand? If not you definently should. It helps canceling vibrations tremendously