I made one simple box for my Stream Deck MK2 to add it as a buttonbox on my sim rig.
4 pieces of M3x20 is needed for attaching the top to the bottom, selftapping holes in the top.

I used the mounting from https://www.printables.com/model/128000-stream-deck-mount-for-8020-rig by https://www.printables.com/@RasmusA to mount it to my 8020 rig profile.

Printed on Bambu Labs X1C with black pla, file with my settings provided.

I also provided the Fusion360 file if someone whants to modify the box.