Got a case and other parts from a shop. Here they are

• The case:

it is a little bit smaller as 2 sheets A4. made from steel. very solid. with a plastic face, but a lot of holes. I'm thinking how to close it from a dust. The screw pins on the bottom side are on wrong places - I will need to drill them out.

• The power supply

a very critical component of the system. that is why I disassembled and checked it by own eyes. The quality is acceptable. The transformer is shielded. The red line is a border between 220V and low voltage parts. all electrolytic caps are for 105 C. and for 10V voltage in the low part. EMI filter on the input. no not-filled holes on the PCB. Some additional soldering on the 5V/4A bus. Schematics for supply less than 50W acceptable.

• Other parts

raspi, fuses, fuse holder, input 220V/10A socket with a filter, a button with two LEDs.

The power supply is normal PC power supply, which requires short the signal circuit to start it up. That is why I bought a button without fixation, but switching contact lead me to the dram, that it would be possible to switch on / switch off the raspi with this button. I need to think about, but have a feeling, that it is possible.

That is all for now. I will do a layout, how to place all the components inside the case. Unfortunately the relay shield is awaited later, but I will leave enough space for it. Probably will start to do placement and mechanical work on this weekend.