Thanks @lalitk ,
But tonight I got a message that the compact power supply I ordered is cancelled because it became "out of stock". I was initially disappointed a bit. But then I thought - things happen for good. So now I will look to use a Linear Power Supply to power up the PC. Also will go with a ATX mothernoard instead of micro-ATX motherboard. The goal is to use a Nano160 PSU (DC-DC) and power it with a Linear Power Supply. So the build is going to take some time to start.