Chuck,
Without getting into a long explanation, there is more to it than just wiring.
A true dual zone AC system (like the new 2008 Anniversary Edition Montana) has 2 ACs that share the ductwork, and a temperature sensor located in the 2nd zone that communicates with the thermostat. The thermostat monitors temparatures in both zones and operates the ACs as needed for the particular zone. Even if you wired for the 2nd AC to work with the thermostat, it would be pretty inefficient to have a non-ducted AC supplementing a ducted AC with vents right next to the non-ducted AC.
Without major modifications, I'm not sure you could achieve what you are trying to do.
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