I have been trying to add provinces and balance units, as well as give Egypt greek units. So far I have been able to add some provinces (unhistorical names because I want to work on gameplay not accuracy).
They work, and fit in with the right cultures. Vorbis' Province Tutorial saved me. It is the best tutorial for wannabe-modder newbies like me who want to simply add provinces.
The balancing has gone quite well.
The only thing I need help with is adding Greek units to the Ptolemaics, unless there is a minimod that does that for 1.2
What I am trying to do is let Egypt have hoplite militia, greek cavalry, lancers and levy pikemen, and get rid of the Pharaoh guards and fantasy Egyptians (not peltasts, nile spearmen or axemen though - they stay as auxiliaries).