Wouldn't suggest Multisite because you just don't need it.
I'd suggest custom post types with custom taxonomy type support so you can create categories for each CPT.
Rather than use a Widget Logic plugin, i would use a custom sidebars plugin so all the sidebar content is related to one specific article type.
WordPress enables you to assign roles to different users when you register them which you can control further with capabilities, if needed, using a plugin like members or you can code this by hand.
Here's the code i would use to create the CPT's and add taxonomy type support.
add_action( 'init', 'create_cpt_taxonomy_types' );
function create_cpt_taxonomy_types() {
register_taxonomy( 'article-type', 'news',
array(
'labels' => array(
'name' => _x( 'Taxonomy Types', 'taxonomy general name', 'theme' ),
'add_new_item' => __( 'Add New Taxonomy Type', 'theme' ),
'new_item_name' => __( 'New Taxonomy Type', 'theme' ),
),
'exclude_from_search' => true,
'has_archive' => true,
'hierarchical' => true,
'rewrite' => array( 'slug' => 'article-type', 'with_front' => false ),
'show_ui' => true,
'show_tagcloud' => false,
));
}
add_action( 'init', 'add_custom_post_type' );
function add_custom_post_type() {
register_post_type( 'news',
array(
'labels' => array(
'name' => __( 'News', 'theme' ),
'singular_name' => __( 'News', 'theme' ),
),
'has_archive' => true,
'hierarchical' => true,
'menu_icon' => 'dashicons-welcome-write-blog',
'public' => true,
'rewrite' => array( 'news' => 'article', 'with_front' => false ),
'supports' => array( 'title', 'editor', 'author', 'thumbnail', 'excerpt', 'trackbacks', 'custom-fields', 'revisions', 'page-attributes' ),
'taxonomies' => array( 'article-type' ),
));
}
I tested the code on the Twenty Twelve theme however it will work on any theme after you paste it into your functions file and re-save your Permalinks.
I'd only use 2 plugins if you want to control the capabilities of different users in your organization and for assigning custom sidebars.
If you prefer not to code your CPT, you can use a plugin.
You will need to create templates for archive-cpt.php, taxonomy-cpt.php and single-cpt.php if you want to make these different to the standard pages WordPress generates so its not essential.
