1200mmX900mmX170mm 4axis cnc

[Nickhofen]

I have start my wiring, I am following Routercnc's schematic, since it is easier for me to understand.
The control panel is going to be like the one in the picture, I haven't put a water pump activation button for the water cooled spindle since it is going to be activated from the spindle start button.
Do I have to add another button? Is the ergonomic ok? Your thoughts please!