Since I have no knowledge of the specific story of the Palace of Kottaipuram, it could potentially have main features such as its construction purpose. Was it built for defense, as a display of wealth, or for some other reason? Also, the events that took place within it over the years, like important battles, coronations, or cultural celebrations, could be main features if they are part of the story.
As I don't know the full story, I can't be sure of the main features. But it might involve the people who once lived there, like the rulers or the nobles.