Maybe my version fix your problem. I convert my Connect in a basic camper. So i need a window to ventilate the "living room", in addition, for reasons of safety, to look through while turning. So i visit my local caravan finisher and ask for a caravan window. We find one that fits the sloping surface without warping the metal. He install me the window including a subframe and i cover it with wood and a roller blind.
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Have a nice day.
Matthias