Didnt get the shipment today but looks good your stack there...
Can you tell me what power-y-cable you used?
I ordered the psu that Bitburner has on his website. It has cables for in total 8 boards.
You can also power 2 boards with just one single power cord by connecting the second one via standard wires:

Cool... thats my route then... easy way.
Edit: How many boards can i connect this way? Theoretically so much like the 12A-connector from the psu can deliver?