Added a redundant switch (half the nodes per switch, separate ports on the main router and a bridge cable between them as a shortcuts for traffic. Is it a good idea?)
did some rudimentary cable management.
Next step for tomorrow(or so), move all the nodes to Proxmox.
Next for next month, buy a NAS or build a couple of desktop with many disks for a SAN (CEPH or GlusterFS, still ideating)