How feasible is this plugin?

Hello! I have programming experience but I’ve never worked with WordPress plugins before. I want to know what the limits of WordPress development are before I spend time learning it. Can anyone tell me if a plugin like this would be feasible?:

1. A WordPress user creates a project. That user is the project owner.
2. Alternatively an admin can create a project and assign a project owner
3. The project has a title, a description, and one or more tags which can be edited at any time by the project owner.
4. The project owner can add tasks to a project. He can also mark tasks complete as the project progresses.
5. The project owner can make announcements regarding the project which will appear on the WordPress home page along with announcements from other projects.
6. The project owner can close a project
7. WordPress users can view a list of all projects sorted by tag
8. WordPress users can join projects that they are interested in to post comments to that project, receive email notifications, etc.
9. WordPress users can leave projects if desired.
10. Project owners can message all the users joined to a project.

So what are your thoughts? How much work would it be to implement something like this versus building a RoR site or something similar?

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