the Watson POC is just an example, should probably be expanded to span multiple nodes somehow but that falls down into k3s config. You should probably use an iso for the master and then build isos for the slaves with the master address on them

that or mix the Watson POC with the Lestrade POC (https://github.com/Itxaka/lestrade) which accepts the initial config via cloud-init, so you could deploy a master and then slaves by feeding the VMS/baremetals different user-data config