[AgX]

Autofocus:

The Colormat was a very advanced system. But though it employs a motordriven system in the colour had, the autofocussing is done, in contrast what you assume Adam, pure mechanical via cams.

I assume the cam-system for autofucussing is hidden on the pictures you are showing.

Exchanging the lens seems a bit complicated
After inserting of the individual lensboard the main "lens" board has to be pulled up, the individual board has then to be clicked into place and the main board pulled down again. Then the larger ring at the very lens barrel has to be turned untill it clicks into place.


Automatic-Exposure meter:

At the right hand side you find a switch for the framing light and another for automatic-exposing.

At the front side you find a knob for adjusting the meter to the sensitivity of the paper. Make test exposures, with variated settings of that knob. The setting with best result with a typical negative will be the standard setting for exposures on that paper.

On the left side is a cable with plug to control size of measuring field.


Filtration control board:
I don't know.

But it looks as if there are six basic 3-colour settings, a selector for those six settings, a 3-colour overrride-setting.
However, the way the lamps are burning at your photo is contrary to my assumption...