I think that Hollin/Eregion should just be added to some more general Noldor list, it doesn't work as a complete civ. A civ with three city names (of which one (Moria Gate

) belongs to another civ) is not a
civ, it's a
headache.
I'm equally unconvinced that Lorien should be a civ, that city list seems to mostly have different names for Lothlorien wood, not real city/settlement names. I think Lorien also could be added to a general Noldor list. Or be the Noldor to which Eregion and maybe others are added.
Quantity isn't quality, my friends, I'd rather have some rock-solid civs than a big bunch of not-as-solid ones.
Angband has Lugbruz on the city list. Assuming this is Lugburz spelled wrong; this is just another name for Barad-Dur. So, wrong spelling, wrong civ.
At first sight I wondered about the sanity of The Last Conformist, until I realised that there might be more than one Denethor.
One way to treat Fangorn would be to let them build (let us call them) Huorns first, with the immobile flag. These can then be upgraded to Ents(offensive) in the fourth era. I think that the easiest thing is if they can follow the usual tech tree, it's just that all the techs are useless for them. Fangorn shouldn't be able to build workers or settlers either, just Huorns (defensive).
SoCalian, good work, altogether.
I'll end this really intriguing post by yours truly by posting a couple of techs:
Tech ID #: 64
Name: Warrior Prevalence
Era: 4th
Unit(s): 4th era def (men)
Buildings and Wonders: none
Resources: None
Worker abilities: None
Other Abilities: None
Tech ID#: 35
Name: Troll Breeding (was Olog-hai Breeding)
Era: 4th
Unit(s): Cave Troll, and ev. Olog-hai
Buildings and Wonders: None
Resources: None
Worker Abilities: None
Other Abilities: None
Sir John, I at least used one of your names.
Arathorn, PCH is working on adapting and updating your excel document.