Here is a case I have been working on for two years for the pi zero. 3d models at “http://p3d.in/u/zero82386
has room in the bottom for the board to fit flush if you have soldered headers on.
just needs M2 2.5x3mm knurled nuts to mount the board. opening for a 15mm fan in back and sd card reader in the front. hole on side/top for the micro sd. let me know if you print I would be very interested to see what you do with it!