Unfortunately the Eastern Extension map I have designed is not available in an on-line format. The Board I made is a large, full-size map for playing on, and I have yet to figure out how to convert it to a computer file. I'm working on it.
I was never satisfied with the Western Extension map and what it did to the board. It isolated the Iberian player, eliminated a player from being definable as "Roman," and reduced the value for the African player of moving eastwards.
Ultimately an expansion map that includes territory east of the current Civ board makes more sense than a western one. The areas to the west of the Civ board played very little part in the major events of the period in question. The one culture that is represented by the geographical areas, the Celts, while having an advanced poetic and musical culture, and a metallurgical technology superior to their neighbors (such as the Romans), as far as the game is concerned they would be considered a barbarian culture because their culture was not urban. Likewise the Mauri (later known as Moors and Berbers) were also a nomadic group that remained on the fringes of Mediterranean culture.
Meanwhile, the area immediately east of the Civ map contains areas controlled by the powerful Persian, Parthian, Bactrian, and Mede empires, all of which interacted strongly with the other cultures in the region. These ancient civilizations posessed ancient cities and rich cultures that strongly influenced the development of cultures further West.
Just as the western extension map makes an eight player game more feasible, the eastern extension map makes a nine player both possible and feasible.
In a seven player game, typically either Asia or Assyria is not played, and either Illyria or Thrace is not played. Simply use those two countries which are not used to represent the eastern ones, as follows:
Simply use the same AST table for the unplayed country to represent each new country. If Africa or Italy is unplayed, substitute those pieces for Parthia, instead of using Illyrian pieces. Likewise, if Crete is unplayed, substitute those pieces for Bactria instead of Thracian ones. Also, if both Asia and Assyria are played, only allow one eastern nation to be played. It makes sense to insist that Babylon and Egypt both be played, in the unlikely event that one of those nations is not chosen. Also, to represent Barbarians I recommend using pennies to represent barbarian population units, and nickels to represent barbarian cities.
Note that Babylon now begins the game on the inside of the board in the spaces of Parthia and Susa (indicated by a blue stripe). Unlike Crete, however, this does not mean that Babylon is immune to the Barbarian Hordes calamity. For the purposes of Barbarian Hordes, treat the spaces of Arabia, Al-Hasa, and Oman as Babylon's starting spaces (i.e. Barbarian Hordes enter from these spaces).
Also note that the board overlaps with that of the original Civ. One Space that is part of both boards (Elam) now has a city square on it and is now called Ecbatana (the capital of Media).
Ambitious players might consider making two new sets of tokens (I suggest the colours white and black) to represent the Parthians and barbarians. If this is done, a ten player game using both extension maps can be played.