So, I took a quick stab at this, and I have to say that some creative license will have to be authorized. It is NOT possible to get an exact replica of the in-game Dwilight map using the AoW editor. The reason for this is that certain parts of it were touched up or stitched together in an image editor.
Anaris is not looking for 1:1 copy. Like you said, it is impossible. But he wants something as close as possible.
