Theme Development in Octopress

Octopress is a great blogging engine; however, I seem to have a lot of trouble finding how to create a new theme in Octopress. The official guide I found (http://octopress.org/docs/theme/) only limits to how to modify the official theme, and doesn't really detail the syntax such as ``` {% assign index = true %} {% for post in paginator.posts %} {% assign content = post.content %} ``` nor the directory structures. Other theme creators (http://billpatrianakos.me/blog/2012/10/31/the-making-of-an-octopress-theme/) have simply done this by looking at the default theme, which is the path I might take. But before I embark on this strenuous process, I want to know if there is some kind of guide to creating Octopress themes that I might have missed. Thank you,