Fantasy-Talking i think that there are at least 2 kind of unimind,
the overlord: there is one entity that collect info from all the puppet and take decisions. and its pretty constant in cleverness.
The Cluster: That grow in cleverness by every puppett assimilated ,because every new puppet will host his mind and share calculation , adding
But create a blueprint to create “The Cluster” is something really hard XD
i think that the overlord type is pretty good and doable.