Hi d4cnc

Adding the limits to the e-stop circuit would work as drawn - however, it's a bit unusual for them to have configured it to be normally open. It's a bit safer to be normally closed when running in case a wire breaks etc. and it doesn't work when you press the e-stop.

Adding proximity sensors for the homes is fine but be aware they have 3 wires and run off 10-30V, so they wouldn't be drawn quite as you have drawn them. They also send out 10-30V as a signal so check the board can take this as an input as it could be 5V max.