Reaching this scale means a civilization has spread far beyond its home star, settling system after system and harvesting each one. The colonization frontier sweeps outward from a home cluster, along a spiral arm, until the whole galactic disk works as one — every captured sun a node in the grid.

It implies near-light-speed travel or self-replicating probes, engineering across thousands of light-years, and coordination over spans of time that dwarf recorded history. Nothing in known physics forbids it, but it sits at the speculative far end of the original Kardashev scale.

The model shows the network at full extent — the colonization frontier reaching across the entire galaxy, with the home star marked as a single point inside the disk.