Although not exactly what you are looking for, I have made a complete walkthrough video tutorial of authoring a blu-ray/dvd disc from start to finish using custom motion menus in Encore.
You can access it from the tutorial section of my site, under Product Tutorials:
http://www.precomposed.com/tutorials/
The encore tutorial is the same for all of our products.
Jon Geddes
Motion Graphics Designer
http://www.precomposed.com