I also like the idea.
I'd like to see more life to the city, if it wasn0t for names I wouldn't think it is Rome the city rapresented on the map.
Some pics I've found that could give you the inspiration:
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In addition You should have your current (latest) update on the first post and leave it outside the spoilers. Use [/BigImg] tags

Your victory conditions are still something impossible to achieve....30 territories are too much in any case but specially on a 78 territories map.
If it was my map I would add more buildings and a possible victory condition should be hold 1political, 1military and 1economic powers. (your old/starting idea but easier to achieve)
The roads are not so clear on the map and I'm not so convinced you have to give them a so big importance (big bonuses) in any case. Have so big road bonus would have more sense on a map of the whole italian peninsula, that afterall was the main purpose of roman roads.
Finally, I know that lot of people could find hard to understand what is a
Via, but it's a terrible thing to look at the legend and read "avenue bonuses", specially considering the roman theme.
Anyway, on the whole it's a good start, I'm looking forward your next update.

Nobodies