[jrblasde]

I should also make two more comments. First, the diameter of this PCB is 1.45", to match the diameter of the multi-section capacitor I am replacing. The QC connectors I am using for the twist lock connectors are positioned exactly where they will pass through the cutouts in the chassis. And second, all clearances and creepage distances are in excess ofthe 3mm design constraint. Hence why there are no cutouts or notches in the PCB. I believe the smallest distance measured was 5 mm.

[morzh]

With 450V on separate, especially the opposite layers you simply do not have to worry about breakdown. Not with 62 mils, not with 31 mil....

Looks good.
I would beef up the caps' pads sizes. Also, if you have tall caps, and you also have the tabs that could be twisted, using teardrops makes sense.

[jrblasde]

What are teardrops? Is that a style of capacitor?

[morzh]

No. Teardrops is a style of a trace entry into a pad.

https://www.pcbway.com/blog/PCB_Basic_In...166ec.html

[jrblasde]

Okay, yes. I’m familiar with the concept but knew it as a fillet. Let me make the modifications. You raise a good idea.

[morzh]

Yes, fillet is another name for teardrops, or, rather, one of the type of it. The most popular one.
Teardrops will not be generated if the trace enters into the pad not radially, or if the entry segment is short.
Most CADs will generate them automatically if the option is enabled.

[jrblasde]

Here we are. Not too difficult at all!

   

[morzh]

BTA, the trick to add a teardrop to a pad that is not directly on the way of your 45 degree trace (your square pads) is to break the trace in the middle and zig-zag to another 45 degree trace that noaw has the target pad on its way.
(Or, in case you do not mind using non-45 degree angles, just to go to "any angle" routing mode and draw a direct trace between the two pads).