Does anyone actually have details about the project?

Skimming the wikipage https://en.wikipedia.org/wiki/Project_Cybersyn the networking side of things is rather primitive: a single master node talking to a number of child nodes with no other inter node communication. And a lot of software build in the master node to review what is happening in the child nodes. Nothing mentioned packets, routing, or any of the other more interesting bits of what made the original internet different.

Down the wikihole: https://en.wikipedia.org/wiki/OGAS seems like the arpanet not taken, 10 years before arpanet with the same design goals of inter node communication.