I have finally made the move to my new home in Utah. I have one problem though. I have eight foot ceilings and ductwork running down the middle of the shop area The ductwork is nearly four feet wide and hangs down about a foot so I don't have much headroom. I need to frame around this but don't see how I can run 1/2" drywall across the span without any more support than a 1x2. Any suggestions on how to frame and drywall this ductwork? See the picture below:

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