Friday Morning Puzzler

I have been looking at these pics for a couple of weeks and cannot work out what the panel is from. So I am opening it up for suggestions…

It is large 1.4m x 0.8m x 0.2m and has Dzus type fasteners all round. It has a fastened hatch and a smaller (sliding ?) hatch.

Both the front and rear edges appear to have to be behind a plate.

The data plate is for a servo motor. The Wrk No relates to the servo motor (I assume).

I also assume – German, Bomber or Freighter, late war paint. Upper surface ( from paint colour).

I have a long list of what it is not – but will leave it to you for suggestions.