Has anyone got a rack for the CS3?
I have tried to find to buy one but it seems not possible, if not less we have to made one by self?

What do you mean by 'rack'? A typical English interpretation of this would be a rack cabinet as used for computer equipment in a mainframe environment, or a commercial shelving system (typically metal) as used in a warehouse. At the bottom end the term could be used for ordinary shelving in a home.

The computer desk description given in answer to your post I wouldn't normally regard as a 'rack'. Perhaps you could expand more on what you are thinking of.

That is what I suspect, rather like the cs1 and ms1 had as accessories, which is why I asked for clarification.

Maybe he hasn't realised the cs3 has adjustable feet to control the tilt of the unit.

Take a Look at this Website for some Product's for use with CS 3 / 3+, CS2, MS2 and other Marklin Products.

https://mandau3d.de/produkt-kategorie/modelleisenbahn/maerklin/

I have made an arrangement out of a sort of rolling table with sliding plastic baskets for storing stuff. The tabletop is a piece of wooden shelf wide enough to have the CS3 in the middle, a couple of MS2s on the left side and room on the right side for the pc mouse attached to the CS3 and a few tools or pen and paper when needed. The CS3 is not lying flat on the shelf but rests on a slanted piece of plywood in order to have a better view of the screen. The rolling table makes it eaiser to get to different parts of the layout or to reach under the layout when needed. There are some thin strips of wood at the front of the plywood that the CS3 rests on in order to keep it from sliding off.