I see your point about not being able to have more than the maximum 16 civs and why you have not included 'minor' nations of the period such as Iberian Spain, Numidia, Bithynia, Galatia, Armenia and Judaea. One thing though; you said that you wanted Syracause and Messenia as part of the Greek civilization, but weren't these cities (and in fact the whole of Sicily) already conquered in 210 BC by Rome during the 2nd Punic War? Unless of course you wish to somehow simulate Eunus' 1st Slave War in 136-132 BC....
Here's a strange historical fact:-
Take a map of the Mediterranean and draw a line between Italy and Greece, then extend this line vertically all the way up past Norway/Sweden and down into Africa as far as the desert. All the ancient nations east of this line used archers and slingers, but all the nations west of this line (with the exception of the Numidians) didn't use archers but just slingers! Certainly the Italian nations such as Ligurians, Etruscans, Samnites, Latins, Campanians and the southern Greeks didn't use archers. Nor did the Spanish, Gauls or early Germans. The only archers west of this line that I can find are Numidian, and these were all foot archers, not mounted. It wasn't until Imperial Roman times that the archer became popular in the west, and by the fall of the western empire in 476 AD the archer had completely replaced the slinger both east & west of this line. I find this odd when you consider the fact that the human race has used bows for hunting for at least 10,000 years. Even the 5,000 year old 'Ice Man' found frozen in the Italian Alps carried a hunting bow.
This line is also the same as that used by Octavian and Mark Antony to divide up the Roman world in 40 BC at the end of the civil wars. And it was along this line that the later Roman Empire was formaly divided into East and West in 396 AD following the death of Theodosius.
.....odd coincidence isn't it....