You have mounted end switches??

Not at the moment

is that not essential?

can I mount it somewhere?

u design is very nice, i have this cnc now https://www.makerfr.com/en/cnc/rs-cnc32/

think it's a bit overkill, your design is simpler but robust, but want to use the electrical parts on your design, and I work with end switches

Me too i'm interested to add end switch, is it usefull and how to enable it in the GRBL ?