Here a short update on my Computer Lab Box after more than a year in usage:
I found out that my power supply is to week for more than three targets, the main computer and the switch. So, I installed a 100W 5V power supply and put 5A fuses between the supply than each board.
The first power supply I added to my new portable CompLabBox (see pictures). This new box has also a 12V power supply for the Banana Pi R2 and the ESPRESSObin. The new Box has now the following Targets:
1 x Raspberry Pi 3+
1 x A20-OLinuXino-MICRO
1 x BPI-R2
1 x ESPRESSObin
The main comupter is again a Raspberry Pi 3.