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Yes, absolutly, Zenphoto is able to run your complete site and you need the Zenpage plugin for extra pages if you want to manage them via the backend. It is also possible to manually code custom pages. If you need to code anything yourself depends what theme you are using. Of the official themes Efferescence+ and the Zenpage theme have support for the Zenpage plugin. From the third party themes there are also some.
If none of these themes fit your needs or design wishes you will have to do some work yourself. How to create a theme explained on our theming tutorial. Depending on what you want to do and your general web technique knowledge you may need to do some learning first.
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