This is a simple wooden bunk bed with 3 levels.  It comes with a working ladder to get to the top levels.  It also has a book on the bottom bunk, but you can remove it if you like.

You can use this prefab in your map as long as you give credit to t0XiK~DDT in your readme and you send me a copy of your map (I might want to try it!).

My email is kyle8744@hotmail.com.  This is my first prefab so feel free to send questions/comments as well.