First steps for re-doing electrical

Ah, thanks a million! Comme ca?

That looks good.

Thanks, I appreciate the guidance.

My mill has a base cabinet that has a big opening in the back with a door. I was planning on putting the electronics on a panel and then attaching that to the side of the cavity with drawer slides.

Is there any reason the panel has to be metal? Can I use plywood or do I need a big grounded surface?

I’d use a metal plate and run a bonding strap to the main earth.
There could be a chance if you rely on the draw slides alone you may end up with different earth potentials.
A timber back plate would provide functionally no earth which would not be a good idea if a mains live wire became dislodged.

That’s just my two cents.