Yes, you could do that. I’m guessing that form plugin has an action that you could hook into that passes the submitted form data. Hook in to that action and create a new instance the the cnEntry object. I tend to use:
$entry = new cnEntry();
You can then set the entry details using the supplied form data using the class setter methods. They’re all documented in the code… I think. After you’ve set the data from the form data; just save:
I hope that helps get you on your way with your project!