I think that the game is now playable, and will not crash.
Every single thing I've added, and every single thing I've modded, will have civilopedia files not be accurate.
That's...a work in progress that I'll need to tackle.
But I think the problem was in the techs, which has since been fixed.
So I THINK, then.
That is is actually playable...at least, by me, the maker, who knows what the modifications are.
Well, loosely knows what the modifications are.
I'm pretty sure I made some things ridiculously OP entirely by accident. I reduced corruption (because I hate how even if you have a courthouse and a Minimal corruption government a city producing 6 shields can be reduced to 1, 2 if you're lucky), I may have boosted shield production (not sure on that?) on the easiest setting which is what I tend to play on, and I made a bundleload of changes to buildings and wonders (including a few added ones) which results in some quite...quirky...end results (cities producing like 30 shields less than 20 turns into the game with build times of buildings near-instantaneous), but all the same.
It's much, much closer to what I want it to be now.