I usally make three mods at a time sometimes four plus I made this along time ago.Back when GC2 first came out plus doing that kinda stuff is easy its typing that I have a problem with.

"11 playble races..."

Huh? I saw the game in a store the other day, and it said that we'd exterminated every alien race we came across, and that the enemy was a coalition of races.

Then again, you don't really have to follow the story-line to the letter.  

By the way, what name have you given the humans in your mod? Since we're governed by a theocracy in GR, i suspect something along the lines of 'Holy Empire of Terra'.

Kay, fox... but you may want to consider sitting down a bit & perform a quick rampage over gameplay features and elements - i find it to be quite inspiring to just know EXACTLY how & why, this and that into the game itself work.
Fully grasping such a giga context takes time but it can actually improve any modder's ability to re-invent the wheel, so to speak.

Just designing tech_trees requires thorough knowledge of many things while inserting a few ships here & there may also be tied with comprehensive (or logical, timely & efficient) warfare actions. Etc.

Thus, play. It's fun too.