Good analysis Jeff. Remember though, there's bright sunshine in the lower right of the photo being reflected up and to the left. Notice the upward shadow of the outboard tab of the right horizontal stabilizer on the outboard side of the right vertical stabilizer. That's sunlight being reflected up from the floor.
That same light is causing the lower, almost continuous bright line even with the top of the factory installed window back along the top edge of the patch, then disappearing behind the horizontal stabilizer. Going forward of the factory installed window, the line breaks up for some reason. I cannot figure the exact angles of reflection, but it seems to me the trailing edge of the starboard wing blocks the direct sunlight upward reflection from the hanger floor about halfway into the factory window. These broken lines and the one spot well forward, in isolation, one skin panel behind the cockpit window, may be overhead lights somewhere above the right wing.
The higher, broken line of reflections on both sides of the top of the fuselage are probably from overhead lights. They are too far around/over the curve of the fuselage to be reflected light from the floor. Notice the four bright spots on the outboard side of the right engine nacelle; they're probably overhead lights also. These reflections seem to me to be too small to be from skylights. Because the nacelle is curved, the camera sees only a spot of light there. The broken lines on top are on a somewhat flatter surface and we see a longer area of light reflected back up to the camera. The two bright spots on the fuselage around the tip of the right vertical stabilizer are curious. Perhaps it is a point source reflection from something on the hanger floor off to the right; a tool, a piece of equipment, etc.
The RDF antenna, the forward antenna mast and the tip of the portside propeller are all in direct sunlight. Note the especially bright reflection of the RDF antenna. The top of the fuselage isn’t brightly lit, so I’m thinking the light on the antennas and prop is coming through a postulated row of windows above the hanger door. The drooping elevator is brightly lit; the sun may be very nearly straight-on into it. The top side of the right wing is partially lit by reflection from the floor, I think, especially the trailing edge, as the wing surface curves downward. Given that the trailing edge shadow of the starboard wing is well forward, I thing the sun angle is pretty low. It's June, mid-winter, in Darwin. I'm guessing it's morning, before any clouds built-up later in the day. The overhead lights haven't been turned-off yet.
These different sources and reflections create a pretty confusing pattern, for sure. This is my take on it.