I'm interested in this, preferably as a Phalanx faction (either Pontos or Arche Seleukia). Perhaps (if there are enough people) we could have a match-up as follows:

Epeiros vs. Camillan Roman
Makedon vs. Polybian Roman
Arche Seleukia/Koinon Hellenon vs. Polybian Roman
Pontos vs. Marian Roman
Ptolemaioi vs. Marian Roman

Thus we could use all of the factions against variations of Romans. Also, why must there be a 14 unit limit? Doesn't this restrict factions that used a large number of light troops, such as Pontos, Seleukia and Ptolemaioi? The contest is legion vs. phalanx, but it's only fair that the armies represent their historical use. Should the armies be wholly free for the player to choose? Perhaps we should have a preset % of the army, with the remainder left up to the player. Not sure if you like these ideas, but I'd love to battle whatever the case (is it fine that I live in Australia?).