Very clear and concise! I like how you get right to the point and provided lots of helpful screenshots. This method of making a First Person Camera is very smooth and feels good to work with, it doesn't give me motion sickness like the default one!
I think the one thing I'd add to make it absolutely *chef's kiss* perfect, would be a HTML version implemented into the page so that people can read it without download, to reduce the barrier of entry.
But people who are really interested will download the file anyway or watch Ash's video, so that's not a huge point of concern.
Thank you for the tutorial, it's very helpful and I look forward to using it!