Yes, but it's going to be a bit of a pain working upside down...
get yourself a set of steel punches. The one of the correct diameter will be required to punch out the centers of the rivets. Then take your drill and drill out the 50 or so rivets that hold the frame to the car. Then it gets tricky, there are tons of glue or more acurately butyl rubber holding the whole mess together. You are going to have to pry it apart somehow. I suggest starting in the front and trying to slide the frame back and then up. It's going to be very difficult. It would help if you had a set of spreaders. good luck
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1988 GT (Firebird Interior),1988 Coupe (Daily Driver), 1985 SE (Project Car), 1985 Coupe (parts car), Firebird Interior Installation Website