As revealed in Steve's pictures, the panel which wraps around the lower frame is attached a smidge {technical term) lower, to expose the painted metal frame edge. This avoids the chafing when installing the cushions bases.
I first glue the covering over the TOP edge of the panel only THEN rivet the panel on and finally glue the covering down and under the metal frame, thus hiding the rivets.
I first glue the covering over the TOP edge of the panel only THEN rivet the panel on and finally glue the covering down and under the metal frame, thus hiding the rivets.