A little late to the post buuuuuut....
I picked up GregTech: New Horizons last week and having a blast even though I haven't even finished the stone age yet. The crafting is definitely brutal but not unfair like some other "expert mode" packs I've played, at least for now haha.
For now, I'm just taking over a walled village for a homebase until I learn more about what makes a good base location. Unfortunately, the inhabitants all committed mass ~~suicide~~ mob hugging party so I'm all alone :'(
The inner machinations of their mind is an enigma. I love seeing modded minecraft server builds, they're always so unhinged.