I'm currently running all the current CC content with STEP right now. Nearly everything works without issue. Tundra Homestead needed a patch for landscape and water fixes, I think a patch was needed to get survival mode items to show up in crafting menu do to CCO I think. The only issue i see is there is a conflict with 'wild horses' and 'convenient horses'. They both have menu choices that overlap. Something will have to be done here. Current workaround is capture and name your wild horse before activating CH. Not an option for STEP.