Wiring Diagram check

[JAZZCNC]

It's late now and i'm too tired to look at it in detail but instantly I see you have relays for the homes which you don't want to be using. Wire them striaght to the Inputs on the BOB.
Relay for the Limits wired in series is ok. You will have to set Mach3 to Auto reset Limts so you can reset Mach and reverse off the switch. Other wise you'll need a limit Override switch. Either works fine but overide switch is safer.

Have the E-stop relay turn off a Contactor for the higher power devices like VFD, WP and PSU. This will mean you can use lower rated E-stop relay with fewer contacts. Most Contactors also have an Aux relay contact for control Signals which you could use for the Enable relay. Contactor is much more suited to mains power than normal relay.

Other than that then don't look too bad at first glance.