Freedom of the Press Foundation already made quite good ranking in their "Secure the News" project, so it might be useful to base the project upon their methodology:

They've also implemented a "naming and shaming" mechanism via a Twitter bot that might be a useful idea for this project as well. For example, see this: https://twitter.com/SecureTheNews/status/968569323114586112
And finally, they do have an open source code base licensed under AGPL, so you might want to consider adopting it instead of re-inventing the wheel for different types of organizations: https://github.com/freedomofpress/securethenews