drupal 7 module for nodes with views
Panels is the right module to control this kind of layout. You should be using the node/%node panel in Page Manager and be overriding that.
http://example.com/admin/structure/pages/nojs/operation/node_view/handlers/node_view_panel_context/content

The documents should be uploaded to the Node during editing. If you are missing a field for Documents create a Documents field in the node Content Type of Field Type file. Allow it to have infinite values.

Return to Page Manager > Content. Add content into the right hand panel (using the gear icon). Choose Node and locate your Field: Documents. Add that.

Add your other content into the centre panel. Your left hand panel can be a block (for example a Menus block).