Do you have techs for the new eras, or just plan on reassigning current ones?
Also do you plan on neolithic era for 10,000 BC, and assigning the fire, hunter-gather type techs to it?
The game pace will definitely need adjusted for that
For me, I just did a little mod that adjusted the pace in my game.
While looking into the techfiles there where more then 380 technologies.
With the ones not mentioned, i think we hit the 400 mark.
I would like to splitt the current eras in at least two or three additional ones.
But this would need some lua work, all new eras need to be included. (The files in the Tech direction)
Back to the 10000 bc stuff.
Well there where a lot of things i worked on, like resources (obsidian/flint), new units (wolf would replace barbarian caveman until some techs are discovered).
Also a overworked update tree for distance units like Fireeater, Slinger etc....
New improvements like the tiki, also the ability to plant forest and jungles (later eras).
BTW and not direct related, but i read, since you included the tree of life back into CCTP. (

)
You encountered some little problems, mostly when playing with modded civs.
This is a known problem and whoward allready solved this with some sql lines.
Cant find the link right know, but i think i copied the code already will look at it.