Furnace castle

Majority of us has a bad experience about griefers. They are everywhere, they can appear anytime. The main problem is that we can not always catch them by making screenshots and asking Admins for help. What is the solution?
Of course, there are always lots of ways to protect your house or whatever. Today I am going to tell you about one really weird way to protect your creation.
Now, let's imagine that you don't want to put any lockettes on your chests. Or you just want to surprise someone, show your creativity. There is only one solution: build your house with furnaces and put lockettes on them! Of course, that would take twice more materials and time but it would look impressive. What is more, you can use any of these furnaces. You can even make windows and doors - nothing bad will happen.
Next time I will tell you about dying-and-losing-all-inventory problem and ways of it's sollution.