The sample project in django-wysihtml5 now implements the use case you are looking for. It uses bootstrap-wysihtml5 for the public interface.
The key files doing the work are:
- demo/twitter_bootstrap.py: Implements the django widget used in the ModelForm
- demo/articles/forms.py: Implements the ModelForm for Article
To see the demo in action create a virtualenv, git clone the app, and follow the steps to install the demo site.