I'd like to be able to beat one or more insane AI opponents with Zerg. Unfortunately I can't because I'm just not skilled enough. :) I'd like to know if anyone else can, however?

I've gotten the achievement to defeat 7 insane AI opponents with Protoss and Terran by turtling and massing carriers or battleships.

Is there any way to turtle or otherwise defeat multiple insane AI opponents with Zerg?