Guestbook/Comments

Hello,

Not sure if this is possible but here’s what I would like to do so I am looking for some feedback on whether this is possible.

Basically I want to create a guestbook website where 1 post applies to 1 guestbook (comments). The post would be created with an authors name and email address. Notifications of comments on the post should be sent to the single author for them to approve or trash. So, what I want to do is only show the comments section for ‘their’ post only when the author logs in to wordpress to approve the comment – no other wordpress functions should be displayed in their dashboard and they should not be able to see or interact with other posts.
Is this possible? Either with or without a plugin.
Hope I have explained that well enough.
Thanks

Andrew