Looks like very good pc interface to control cnc machine, I would like to try with arduino mega 2560 with independent dual end stop on Y axis gentry with 2 independent stepper motors on both rails of Y axis. It'll be great if when in normal operation y axis and let's say y' as slave axis run as a tandem, but when homing they home as separate axis to square of the gentry, with two separate end stops or home switches on both y rails. I see the 4th axis control on the interface but it should have some setting to run as a linear or rotary axis and if chosen as a linear and is slaved to any axis, it shouldn't have any separate control in the user interface.