My 1969 C337 D has an opening co-pilot door window. The say only allows it to open for about a 6 inch gap at the bottom, which is not much good for photography. If you remove the stay (very simple) the window opens further but soon fouls on the hinges at the top as the hinge line is set inside the section of the door. We tried moving the hinges so that the hinge line is flush with the outside of the door. The window opened fine on the ground but in flight it a significant positive angle of attack so is forced very hard against the wing touching only at the front so then gets very twisted. Not easy to make it work! The storm window can be quickly removed and a flexible photographer can take through that if you are happy to fly from Right seat and have someone in the way of your yoke!