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Why not just fold it down? Then the area is flat. Also, it you have small flexible stuff like blankets or small bags, they can store in the rear floorboard under the folded seat.
I don't know with any certainty, but I would suspect that if you go deep enough and have the parts to go back you could do it. I would think that they made all the body parts (metal, floors, etc.) the same just for the savings of uniformity (unless of course there were more savings in not doing this).