The reason I asked for a picture was to see if the "panels" had a print. Since it is only about 1/2 inch off I hate adding that small of a outer piece, but if you could add it in the center (or off center ) a vertical and a horizontal strip and it look okay, you wouldn't have to deal w/ the narrow edge. The other thing I thought of was only adding the extra "sashing" to one vertical and one horizontal edge (like a window pane) or the "shadow" type sashing.