A very well thought out and executed panel.
......... However you should run a ground wire from the drives PE terminal to the panel ground and the area under the standoffs on the panel ground should be ground or sanded to the bare a metal. ............ Again I have seen professional built panels that are not as well built as yours.
I like the entire quote, but left just my favorite parts. I had the bare metal call-out on all of my prints for panels. When you are running ground, you must be careful to not add internal ground loops on the panel. It's not critical on this panel but always good to have good fundamentals. I like to draw out a schematic with just grounds, so they are visible. Having a drawing for just grounds on a more complicated project was important, especially when I had new electrical techs learning my design style. When you have package devices in a design like those VFD's and docs are poor, you can't really see all of the ground paths. Sometimes you will need to break out the meter and check the frame to other terminals. Don't assume the engineer designing those devices was the greatest. Shielded cable and routing becomes critical when you got to deal with noise in the 400khz range. Tough to handle hard to understand what choices to make at times. Mu metal is one tool you can use. Not heard of it, do some searching...
Smart DC motor controller, haven't seen one yet that didn't have something wrong. I like Automaton direct for the low cost and solid documentation. Lead times and service great as well.
Siemens controls have serviced me well thou, they are just real expensive. Gear going to Europe, I try and buy everything Siemens. PLC's, contactors, motor starters, Breakers, relays , etc. Spare parts and access drives the choice.
Home builds, never used them so far.
I did watch your videos, I was feeling sorry for you with that hole saw. I made my techs cut large square holes for vents and fans. The Greenlee punches for the small stuff and those stepped drill bits are the trick tool.
For those big holes, a template and plasma cutter does the trick. Template guides you around the hole so you can move faster and not melt the paint too bad. An air powered zip cutter works great too.
How did you reference that DC supply in the cabinet? Hooking a meter from ground to DC common what will you get? Pretty hard to do with those wall-warts. Those things falling out can be issues too. [e.g. you got a machine billing out at $1K / hr or more, and it goes down from a wall-wart falling out. Bosses be ******.]