The coins on the Smaug model, if they are modelled to scale it will have the effect of making Smaug's head look bigger.
Not a suggestion but more a hope that the table will feel more Middle Earth when its finished. The world is such a massive part of the whole Tolkien universe, I feel it's evident when I play my LOTR, but I don't see it (yet) in the Hobbit.
Come on Jack!!!!