Please use the "1.3-W" case if your board has a camera connector on the right side.
The other Raspberry Pi Zero cases didn't seem to fit mine quite right, so I went about creating a new OnShape design that would allow me to adjust certain parameters to get it just right.
I'm still working on the model and will be posting updates here depending on what comments I receive.
12/31/2015: I've uploaded a variant of the cover to access the I/O pins on the Zero. The model has also been updated if you'd like to change the size of anything.
2/5/2016: Added 0.5mm to the height of the case to avoid the HDMI port getting in the way of the cover.
4/3/2017: Added a version of the case with a camera connector opening.
OnShape source can be found here: https://cad.onshape.com/documents/c993e969a52a4661883c1765/w/7dbff4f8027c426091c92394