Hi
although it is a good idea to start making a tutorial from zero but I think the engine need another thing, it needs to be publicized, more and more, and for that if you could make a documentation like what we see about Unreal game engine, especially video tutorials part (http://udn.epicgames.com/Three/VideoTutorials.html), it will be more logical. a wise step.
society needs to know about your engine (how to work with, understands its capabilities and so on), and they will make open source games with the engine like what we see in other project, when it is popular with more fans and contributor at that point surely it is logical making this kind of tutorial.