One problem that immediately springs up is the fact that you haven't used any scopes on your functions. For instance, you've prefixed some functions, such as _query, with the underscore, which tends to be indicative of a private function by Zend Framework standards. However, no scope has been set.

The scopes consist of the following:

• Private: Only members in the same class has access.
• Protected: Only members of the same class and those extended have access.
• Public: Everybody has access (default)

I'll have myself a good read through tomorrow though and see what I can pick out. It does look like a good attempt nonetheless.

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