We recently purchased the Sultan's Castle and Sun Temple. The Sun Temple is huge. We were decorating inside and suddenly found we had no more space. We maxed out the 250 item count for the inside of the house. We had four large rooms that were still not completed. I think a good idea would be to increase the item size for inside the large castles. I know on our Fantasy Castle, we were about 10 items away for maxing out inside. That Sun Temple is so big, 250 items is not enough. I think when making such large castles, you should increase the items inside the castle to 500 so all the rooms can be filled. Just my opinion. Our son was very upset when he could not fill all the rooms.