...I finished the buildings AND wonders in less than 48 hours, across two days where I didn't spend much time on it.
I legit have no clue why the process for these is so much faster.
Now, granted.
I will need to do a second pass on all units/buildings/wonders once I get the tech tree done. (Which is what I am doing next. Tech tree, governments, can be done in either order but tech trees first makes more sense to me now.)
And then a third pass to make each have a unique civilopedia entry so that it's actually possible to know what each unit and building actually does without my creator knowledge.
But the initial stage is there.
So like.
I'm definitely making a lot of progress there.