first, many thanks for your work. this plugin is a little pearl. :-)
I have a page with your guestbook (with 53 comments). I would like to make a dynamic testimonial (carousel) on another page with the last 4 or 5 comments from the guestbook. How can I retrieve these last comments.
The easiest might be to use the widget. You could create a widget area and place the widget there. The widget is somewhat configurable, like number of entries, but not everything is there by default.
If you do want to change the content and layout, it might be easiest to just copy that widget as your own plugin and rename the class. That way you can change the PHP code of it, if you are comfortable with that.