This is awesome! I had tried to build a cluster but with MPICH. But due to upgradation of the hardware and software, many things that were working before, just stopped. However, We managed to build a 70 node cluster. I’ve also made a list of common errors that occured while I was out to build it: http://sourcedexter.com/6-common-errors-when-building-a-raspberry-pi-supercomputer/. This can help many others trying tobuild such a cluster. But overall, it was a great experience.