page attributes in autonav
PermalinkI am trying to add page thumbnail attribute and descriptions.

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Have you found this:
http://c5blog.jordanlev.com/blog/2011/12/customizing-the-autonav-te...
Jordan writes about calling page attributes for each item in the nav, maybe this will be a starting point for your project.
And you might look at the Uber List add-on of John the Fish, you can very easily build your own markup with it and it supports any kind of attributes and all the magic in the universe :) The MagicDate-Suite from John saved me lots of customzation time because it can do so much.
You could try hacking the autonav PHP and try to insert that parts of the PageList Block that calls the thumbnail attributes, but I havent tried that before.
Good luck!