So you want to drill and label it yourself? Then you could just buy the color in a spray paint and a blank 1U rack panel. Search
RAF Blue Grey spray paint. This is what I did for stereo Neve style preamp builds. (i.e. DIY). The Middle Atlantic HBL1 is a nice quality blank Aluminum front panel.
If you want it drilled and engraved, you'd have to find a custom shop that can specify
RAF Blue Grey. Look at Front panel express. This is quite a bit more expensive. Still DIY, as you are designing it yourself at least.
If you want something premade, drilled, engraved, and painted, to fit a DIY Neve preamp build, I don't know of anything.
This is close but in black and mono.
I would have thought this would be the place for such an animal but .... maybe not.
Well, this is a DIY forum. Not everything is available to buy for easy assembly.
You may be better off just
buying a clone like this. You get the front panel and all the other parts. And it's already assembled! haha
The DIY movement has been pretty much eliminated from the clones like Warm Audio at such a low price point.