Okay, okay. I screwed up.I only wanted a quick one before going to sleep.
Here is a corrected version, incorporating Simon's remarks (thanks!) and a few technical details: hole in lower engine cowling, underwing light... I've changed the red paint section but I'm keeping the sloped border as I believe it is the case.
I've also resized and relocated the cross, which should now be correct.
Let me know what you think.