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The duct work should be the rear heat and AC if equipped. Are you going to eliminate the rear air?
Well it can be covered up as long as your not using it. Please explain the other questions, Im not clear on what you needing.
You can disconnect the blower motor and that should keep it from working or just not turn the rear system on . There really is nothing else you will need to disconnect if your not using it.
Removing everything is going to disrupt you AC as well as the heater system. It would require installing new heater hoses and AC hose up front to eliminate and by pass the hoses for both going back the rear. In other words you would need to plumb it as if you had no rear heat and or AC. It may be more trouble then its worth and you may want to consider just leaving the plumbing alone.