Hello there - yup, enclosures are always an issue, and can be shockingly expensive to have made. As a hobbyist, ie one offs - I started wanting to use aluminium enclosures, and Breeze Audio (through aliexpress) used to offer a cut out service...
you can test the external psram with the example
Sketch in the library . It will show if its detect and how much. I had solder issues and reflowed it and it read correctly after that