It would be nice to be able to create project model :

• Default Tree folder
• Default Discussions topics
• Default Calendars 
• ...

When creating a project, a new option could be available

• Project model -> Dropdown to choose the project model to be used

To create a project as a model, we could add a checkbox : "Create as a model" in project creation popup  => The project is associated to the default project category "Models"