I would ask why you use Wikipedia for such a project in the first place. It is simply not intended for this. I think that you will learn more about a system that thinks of a website as a data set, not a set of documents (this is what WAT is in GREAT). Something like Drupal is going to get you where you want to be much faster than Wikipedia - in fact, it has already been done: https://drupal.org/project/answers . I would not be surprised if something like this exists for joomla or even wordpress.
If you look at Wikipedia because you are already using it for part of your site, there is no reason why you cannot run another CMS with it.
naught101
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