based on https://www.thingiverse.com/thing:170243
using the design-idea of https://www.thingiverse.com/thing:28070
Loving the design of the Raspberry-Pi-case (see 2nd link above), i decided to adapt this design-idea to the Udoo.
The Udoo should snap into the case and is then very stable.
Should print even easier than the original as most undercuts were removed.
This design is costumizable - all openings can be closed or opened at will. (i reccomend to only close top-holes, as closing the sides might not work when using a tight case).
Also, mouse-ears are available when using the openscad-file.