Someone asked for pictures of the screens I made:

http://jones.colorado.edu/jones/VW/screen.jpg
http://jones.colorado.edu/jones/VW/screen-installed.jpg

You can see the cut corners (right) to fit into the
curves of the window and the aluminum strips pop-
riveted to the top edge to hold the window in place.
The bottom fits into the window groove and the strips
allow the glass and the frame to hold the screen in.

These are very sturdy.  I made them over 15 years ago.

                        Richard A Jones
                        Boulder, Colorado