Corinth (Organised/Philosophical) : Missing tech leading to peltast in era one; missing tech in era four, which will probably lead to St. Pauls letters GW. No UU; might be the missing peltast?
I wouldn't give them a Peltast for a UU, because the Peltast is Thracian. I would actually give that unit to Macedonia rather than Corinth, too...
For a Corinthian UU, how about either some form of Hoplite or some form of Galley? I've given them an all-round better Galley in my Greek scenario.
Norse (Seafaring/Warlike) : Missing tech in era one; missing tech in era two - that normally leads to civ-specific government and a unit. No UU - how dare I? Please help!
The UU could be a Berserker or a Longboat, could it not?
Persia (Philosophical/Stable) : Missing tech in era one; missing tech in era three. Possibility of extra library-type building available from the start (not in the game at the moment). Should maybe Spiral Minaret (available in era two) should be shunted to era three and have a tech of it's own?
How about their Era 2 tech could be something representing Darius' reforms in Messenging(if that's a word

)/Postal Serveses? It could give a wonder (Persepolis Palace? Or just plain Darius' Reforms?) that places a "Traveling Inn" in every city, which gives the city a small defensive bonus, and allows Persian units to "airlift" to each other via the "Veteran Ground Units" flag? I think that would be a good way of representing the Persian mobility!
Scots (Agricultural/Philosophical) : Missing tech in era one; no UU. I'm thinking about using the Highlander unit somewhere on the forum as a replacment for the Medieval Infantry in era four.
I'd say go with the Highlander!
Sparta (Industrious/Warlike) : Missing tech in era one (the one used in the earlier demo was given to Athens). Suggestions please!!
Missing techs could be:
-Gerousia (the "republic" part of Spartan government, but only for about 30 people who met certain requirements)
-Agoge (The same, but for everyone who was both Spartan and over 30)
-Krypteia (A sort of cross between a Spartan initiation ceremony and a Secret Police service. Could perhaps give Sparta a Small Wonder that allows them to operate Espionage?)