Ah yes, it has the exactly same affect as the stacked drone build building thing, I guess you can do that with pretty much all zerg buildings then.
Wow that's really intesting discovery, it's much better then my suggestion.
Addition: I tested, all zerg building (except infested CC) can be disabled, and they will be walkable. But the hatchery, hive, and lair does not produce larvas, and the other buildings have no functions either.
Addition: Buildings made by stacked drones are fully functional.
Addition: Some images
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