Hey Bernd,
as requested, here are some Pictures:
This is a topview of my PSU.

I ordered my cases at nrgrecording. The PSU is connected with two 7pin XLRs to the main Unit.

This it the STA main unit, sitting on top of my third 670 clone, which has also a PSU in a separated housing for putting it floorside in a mixing desk and only keeping the important stuff topside with the engineer.
The meters in both units are from Meter Sales, all Big Knobs are sitting on stepped switches. Went for the kukaudio china version, as I found these to be very reliable and I´m really not a friend of ELMA prices. Mounted about twenty of those in my recent MQ5 Build, and not one position was faulty or giving me any hassle. Really can recommend those.

Still waiting for some very last SMDs which weren´t in stock at the time, looking forward to fire this up.