'do' not 'due'....
The word 'do' is spelled 'do' not 'due', dude. This was more interesting than some other tutorials. My take on the genre as a whole though is that they ought to teach technique -- not serve as a substitute for hitting f2 and searching the documentation for half a minute.
Well done though, for what it is. That can be done from the document class too, I believe. It would have been nice to see that in there too.