I did a similar map of the world at the same scale as Dragon Pass board but I did it in hexes with a 15x10 hex page of A4, so that I could created different boards for different eras and different battles.
I did it is black and white, just the terrain types, so that I could photocopy, appropriate pieces, stick to a large mount board and voila, have a map that I could then colour in with relevant political area or wotnot. It was easy to "Corflu" anachronisms, such as where I believe the River of Cradles changed course in the 2nd Age, or where the hole for the red moon is, etc.
Alas, I no longer have all the sheets, but some evidence of them survives on the web.
Good luck with your maps.
Keith
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