You will have to update the cast from InventoryPlayerController to your own controller in some of the Usable blueprints and also the InventoryManager and UI Blueprints.
Also I would recommend changing your character class to use the EquipmentCharacter as it’s base that way you don’t have to manually move the player equipment setup into your own character if you don’t want to right away.
I will be releasing a video later this evening that will go over the merge steps.
