You can download my Fusion360 files at the end of this blog post to edit them as you like! Please don't forget to give me credit :)

Slim case for JJ40 v1.5 PCB from KBDFans.

Hardware:
~ 5x screws M3 x 8mm
~ 5x washers ID 3mm
~ 5x nuts M3
~ 5x rubber bumper feet Ø9mm (optional)

Check out the project log on ivndbt.com .