Integrate guestbook with drupal core as a new content type with comments (for moderation purposes)

I wanted a guestbook that anonymous users can post
but their comments get in a moderation queue
but I did not realize how it could be done

finally I gave up, this is my solution
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created a new content type "guestbook"
changed the appropriate comment settings
and enabled "Anonymous posters may leave their contact information"
enabled core module "profile"
at admin/user/profile added a new field "url"
created a new "guestbook" called guestbook
and gave anonymous users permission to post comments
(also enabled "admin block" contributed module for comment moderation)
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I am not sure how this module guestbook is implemented
but maybe you could benefit from implementing it as a new content type
in order to have comments pass from the core moderation queue