Nice tutorial, but as a photographer myself there is one thing that I would like to point out, When doing close work like this, although it's tempting to use the widest (highest f/stop) to keep things sharp across the image, but with most lenses the higher to fstop the more the lens is working out of it's "sweet" spot. You can see the qaulity drop with anything over f/22 usually, anything more than this and chromatic abberations (purple fringes) become visible on most lenses.
But you have done a great job in writing the tutorial, will help a lot of people out I'm certain.
Regards.
Chris.