HMVC Architecture submodules

[eluser]Unknown[/eluser]
I'm working on a content management system in Codeigniter with the Datamapper and HMVC extension. My question is, how to handle submodules.

Example: I want to create an User module which exists from Users, Usergroups, Rights and Modules. In codeigniter I have build it now like this:

Code:

Codeigniter root
    application
      modules
        Users
          models
            user
            right
            usergroup
            module

Is this the right way to fix it or do have to make seperate modules for each of the "sub"-modules (right, usergroup, module)?