IMHO. if you wanted to turn it into a excellent beginner tutorial you would have to expand the boolean, texturing and lighting parts. Beginners will not get that part. Even the trees as bushes. You got to step right threw it step by step for beginners. Your about 20 pages short for beginner. Ya intermediate advanced. If you expanded just the texturing and lighting a bit it would fit intermediate. Like stand back for a second and ask yourself what are you trying to teach? How to build this scene? You haven't done that. You jumped over complicated parts. Add a few more pages to smooth it out.