Duster Rear Window Louvers

I think the last louver can be shaped to match the window at that end. Think of it as if you have a flat piece that is the shape as the window. Then using your 3/4 or 1/2 inch border you draw the shape of the louvers in that flat.... matching the contour of the window all around. That shape is what gets laser cut. Now you bend the louvers up and fill in your ends with welded pieces. That last louver might have an arch downward on the top edge...