The three ages of C'tis composite wouldn't be so bad.
An Ermor-Pythium composite would be farking insane

.
That said, for now, I will probably be making composites of the existing nations.
I'd like feedback on my first round of balance/compliance changes. This post will contain data on Foodstamp's mods.
Haida Gwaii:
* Replaced all "River Fortress" (admin 20) with "Tel City" (admin 40).
* Changes to commanders:
-- Eagle Talon is now AAAEE, 110% AEWN. Costs 300 gold (Grand Master, +10% for not being old and lightning res).
-- Voice of the Killer Wales is now WWWN, 100% AEWN, no research bonus, can sail. Costs 225 gold (Goetic Master, + for not being old and for water breathing.)
-- Coyote Mother's stats are unchanged, cost reduced to 150 gold (Mother of Avalon, plus for a priest level).
-- Kachina is now stealthy. Stats otherwise unchanged.
-- Toad Tribe Shaman now costs 75 gold.
-- If I can manage it, Sgaana Tyee will grant small number of units waterbreathing.
* Changes to National Summons:
-- Thunderbirds are now sacred, stealthy.
-- Frenzy of the Deeps costs only 12 gems, spell is level 3.
* General Comments (things I can't/won't do):
-- Shouldn't they have a spell that makes an Orca? Probably as a commander, maybe with death magic?
Gaea
* Misc Compliance
-- Gaea, just as a name, not so different from Pangaea. I'll use "Kishar", a sumerian equivalent. The nymphs can be renamed Asherites, and the dryads can be renamed Inanites. The ents are compliant.
-- The amount of nature needs to be reduced slightly. 6s on things is just a bit much. Single path kinda isn't viable. I'm going to reduce the nature on all the stuff by 2 and give them NESD randoms.
-- I'm going to add a bunch of vinemen and vine ogre related stuff, since that fits them into the game world as a distinct nation from Pangaea.
* Pretenders
-- World Tree is now NNE, domstr 4, and is free (as a game balance decision to encourage you to take it.)
* Starting Army
-- Starting army is now 15 sprites and 20 vinemen.
-- Starting commanders are now a nymph and a.... something other than an ancient.
-- To be continued --