Manfred, you are a plane designer. Par excellence. I just went through a rivet count on your C-47 and cannot fault it in any way.
Small things that most people will ignore from the air speed venturi tube on the port side to the bobbed tail that C-47s had in order to tow gliders. Most put the pointed tail on the C-47 that only appeared on the DC-3s. You even have an unlocked tail wheel. I am truly impressed! You are the master.