The following pictures show my first design. I started with this a long time ago and even if it ended with a frustrated me, I learned a lot from it.

The initial idea was to use the famous 28BYJ-48 stepper motor that controls a belt driven 3D printed axle mechanism. 

Long story short: In theory it worked, but in daily life the pointers often lost their calibration and therefore lost the alignment.

After investing so much time and money I was really frustrated at that point and buried the whole project for some time.

Below you can see some pictures of the initial prototype.