I designed my Pwnagotchi case around my build:
It's a snug fit that exposes the USB ports while the cover is dovetailed and slides into place with just the right amount of tension. The window on top exposes just the visible portion of Pwnagotchi's display.
Have fun making friends and above all else, happy making!
If you make one, send me a Pwnmail and let me know how it went: