Everything I know about Kubernetes I learned from a cluster of Raspberry Pis
3 years ago, I also wanted a bare metal cluster for my homelab. I wanted x86-64, low power consumption, small footprint, and low cost. I ended up building this 5 node nano ITX tower:https://vyshane.com/2016/12/19/5-node-nano-itx-kubernetes-to...I think that the exposed boards adds to its charm. Doesn't help with dust though.