Clock example for SCAD

I've finally made it!
This is a fully 3D printable clock that gives the hour accurately twice a day!

OK, no more jokes, what is this useful for? Well... it is just a learning model. I created it as my first (very, very basic) model in OpenSCAD, and published it for other learners of OpenSCAD to have a simple example to look at.

It has customizable features and deals with the following issues within OpenSCAD:

for and if structures.
Scalar variables and arrays.
Geometric operati