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I did a similar implementation as you sometime ago.
I used also the JCR Data Control for display the content in an ADF Tree.
For the preview of the content and manage it I used Document Viewer Task Flow. When user click in a file, with PPR refresh the Task Flow to show the preview component (I tunned a little this component creating a custom wrapper for disable some functionality not needed).
About the update metadata... Use an iframe with the IdcService of updating metadata (Checkin service).
I hope this help you.