unusable, it conflicts with its self in the mod order. using vanilla assets with CGE in position and just this mod causes it to conflict with its own file IC_Alternate_humans.

Dark ages compatibility ?

Thanks

If you open the files for Glass Fortress, it has an entity file that starts with [SELECT_ENTITY:MOUNTAIN], this adds the lines below it to the vanilla dwarven civ.
Do the same thing to this mod's civs to add those recipes to it, their ids are ALTERNATE_HUMAN_DESERT and ALTERNATE_HUMAN_ICE, put those in the place of MOUNTAIN, either editing the existing entry or copy-pasting to make a new one. This will likely require a new world to work.

No problem. Only thing so far I've seen that has broken saves is removing reactions via an update.

Any chance you'd know what kind of tweaks I'd need to make to make this compatible stuff like Glass Fortress and the like?

No, this was an oversight, thanks for pointing it out. I've updated the mod to make minecarts (and stepladders) craftable by both civilizations. I believe it should work if updating mid-save, and I apologize sincerely if not.

Is there a reason that minecarts are disabled for these civs?