ok so what you have to do is to download each of the files and then you have to go to %appdata% and find .minecraft and then go to saves. then what you want to do is to create a new folder in saves under whatever name you want but in the case of this build you might want to call it falling sand art or something like that. after you have done that get all the files you downloaded before and put them in the folder you just made. then you should be able to start up minecraft and the world should be there, if its not then just private message me and I will see what I can do