Don't need a whole case? Just mount your Pi where you need it.
The author remixed this model.
I liked the simplicity of the original design so much that I decided to make it complicated. Changed the orientation of the cross-member and added tabs for mounting accessible when the Pi is fitted.
Thanks to @unreadablenam_405355 for the original concept and design.
Note: One deficiency I've noted right away, is if you're using the USB power input, the screw head in that position may interfere with your microUSB connector. Worst case, just mount using three of the tabs, or use the version with the counter-sunk holes.