Rasperberry Pi Zero back cover (costumizable, with openSCAD-file)

This is (or should be :-) a simple but to some degree customisable back cover for all versions of Raspberry Pi Zero. The uncustomized or default version will allmost look like http://www.thingiverse.com/thing:1836302 (which also inspired this thing - and might help you to turn your Pi Zero into an usb dongle which can share your PC's internet :-).

I wanted to be able to independently add and adjust overhang of the back cover on all four sides, e.g. to add coverage of the camera connector of Pi Zero v1.3 and Pi Zero W.

You should be able to adjust e.g.:

• thickness of the plate
• height and outer diameter of the mounts
• radius and depth of the screw holes (up to completely "drilled" through)
• independent overhang on all four sides

Users of OpenSCAD should also be able to further extend this thing on their own.

For STL-users I uploaded 2 STL-Files, one with a back cover size identical to Pi Zero, the other one on one side adds 1 millimeter for the overhang of the camera connector.

UPDATE 18.03.2017 UTC+1 (MEZ):
Updated comment usage to conventions of Thingiverse customizer (version ..._v1m02_customizer.scad). Customises better, but looks much uglier in OpenSCAD.

No other changes. Better human-readable openSCAD-file (..._v1m02.scad) also in the update. Original SCAD_upload deleted, since no differences than some unprecise comments.