I like the story about King Yeong Jo, that is a hard decision and I believe it was not easy for the King to make it. But as many of them think, they need to think about their country, their people, nation and we see in many other countries in old days the Rulers were ready to sacrifice but still remember and appreciate the price of it.
You are right the wall made of roof tiles is a good idea, like stones they will last for very long time. I like those two sculptures, both look so cute and smiling :)