Wolfdog was kind enough to create a functional mod for Civ VI from his Civ V Leopard 2 Assets and I offered to upload it for others to use. This is a brand new unit that is buildable by all civs. Other than switching the icon to use the same one as the Modern Armor, I've made no other changes from Wolfdog's test set-up. Any other changes to unit stats or to limit it to a specific civ (i.e. Germany) will need to be done separately.