If I were to make this I'd try and make it more excact. I'd download the Runescape map and copy it pixel by pixel, but I guess that will take longer.
The difficult part with that is, we don't know how tall the runescape character is, block wise. If we did, it'd be easier. Furthermore, we cannot just use the World Map to create the world because we don't know how tall all the buildings are and if they curve anywhere.
Perhaps you could use the Mystic Ores Mod for extra ores in the mines?
i can pesroally use any mods but id prefer to use mods that only the server needs (plugins)because its not all the great to have to download 3 or four mods right before you get on a server you dont even know youl like