I played a bit on the design for the foldable wings, but in the end opted for butterfly wings.
Step 1: The Mock Up
The front part is 130cm wide and 165cm high. The wings are each 65 cm wide.
I'm planning to use a 10 to 12mm thick wood boards.
The wings will be attached to the front by 2 hinges on each side.
The window is 110cm wide and 60cm high.