I had mine made by PCBWay out of aluminum with the decal done in a white silkscreen, but you could easily 3D print it, or even just paint the aluminum yourself and ad a vinyl decal.

I used these 6x2 magnets - https://amzn.to/3RrDCmy (Amazon Affiliate Link)

Designed for a Schecter Sun Valley, but should replace any cover 140x87mm around 2.15mm thick.

Check out the video for more info, and consider checking out https://pcbway.com/g/xpXdUB

https://youtu.be/b5SqpllMv60