http://raspberryjamberlin.de/zero360-part-2-connecting-via-otg-a-cluster-of-raspberry-pi-zeros-to-a-pi-3/

This is basically what I'm following to set up the cluster. Meh, so much for me doing the hard work :D Every SD card is flashed on configured (at least that what I hope).

I'm waiting for the currently printing 4th version of my minimal cluster holder.

I think I have the center of the usb plugs and and everything else right, now. This will integrate fine into my cluster build. I've added Letters for USB and Ethernet to not confuse orientation. The SD cards all have to point in the same direction, imo.

The only thing annoying me at the moment is the usb cable management. A self made 4port usb to 4 single micro usb plugs is in development, but for now I use the Anker 15cm cables. There's definitely room for improvement.

For better fitting an angled network cable should be acquired as well :D

I'm still too much of a wuss to solder the usb ports directly and I wan't a clean looking build.