Hi Ian

First thing that strikes me is you haven't fused things. That toroidal may also appreciate a D-Curve MCB.

The limit switches will probably want powering. I'd suggest some power indicators to notify you when things are live.

Just have a single earth bus rather than two.

I used DIN rail terminal blocks with bus bars. Seemed to work absolutely fine. Nice and tidy.

I connected my VFD through a single feed into the cabinet, but I used some noise suppression on the mains lines to reduce the noise output from the VFD. Just £3/unit from China. Commonly its suggested to take the VFD power feed from somewhere else in the room, but I can't tell you which is best. Some VFDs say in the manual not to turn them on and off via a relay, so I don't have mine on one.

If it helps, I've posted my circuit diagram on my build log, post 89, around page 9.