Nice development.

To be honest i have similar size machine and though i have bought the sensors/the smallest mechanical ones, that people around forums say work fine/, i have never mounted them. May be others will disagree but for this size machine, driven by steppers i don't see a reason to put sensors at all. I use the soft limits and with some care am ok. The worst that could happen is for the motor to stall at one end of the axis. Yeah, it happens some times and nothing breaks.