This is an example of a back panel made from PCB by ELECROW. It is another non-standard use of PCB, where the board was used as the rear panel for a DAC enclosure. As you can see, the black PCB looks very good, and one of its main advantages is that all labels and markings can be made in a very neat and professional way, which would be difficult to achieve by other methods.
All components fit very well, and the hole machining is very accurate. The overall manufacturing quality is good, and I can also recommend ELECROW for this kind of non-standard PCB application.