This is a freestyle structure that does not represent any real World structure. It is very loosely based on the architecture of Thai temples, Nepalese Temples or Khmer Wats.
It is not a "fully sealed" structure and thus is not proof against hostile MOBs, modification will be required if ingress of hostile MOBs is to be prevented.
It is built "in and around" the terrain and vegetation rather than replacing it. It us unfurnished and has no real purpose...just a folly in Creative Minecraft.