I screwed the hinges on the woodwork and after that mounted the frame (with glue and screws). Some of the wood is not exactly to my liking, but then again it is hard to screw these thin pieces exactly in the middle, after the panels are mounted you won’t notice it anymore.
I taped the drawings of the panels to the front of the frame. I started at the left side and when I came to the right side de drawings were outside the frame. Wrong measurements? After measuring everything it appeared that I had cut the drawings a little larger than the real panel size, fortunately, or else I had to make a new frame or alter the drawings for the panels.