Yes, I'm building one. And I've decided it will not be on my land. I'll show you screen shots of it's progress.

1. 
   First we picked a plot of land and saved it into the database. Then we gave it a grass texture, then added a concrete block object onto it.
   
2. 
   After adding a concrete block, we outlined this castle type shape and lifted it off the concrete.
   
3. Coming Soon, but how is it so far.