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Rich, This is an interesting idea and AFAIK hsalazar was in the process of authoring a book about xoops. I was involved with the technical editing, but have not heard any news recently.
Such a project would be possible, but I fear it would be out of date on publication. They say a week is a long time in politics, well even longer in the CMS world.
Let's talk about this very soon although my main priority in the new year is to bring the XOOPS FAQ up to the requirements of the community as discussed on other threads.