Use Wizards with Project Templates

Question

I'm trying to create a wizard for my project template like the one demonstrated below:

http://msdn.microsoft.com/en-us/library/ms185301.aspx

This great example shows how to add custom parameters to a project. What I want to do is allow the user to select which files should be added to the new project from the template. example: On a particular project being built from the template, a user does not want to include linq assemblies and references because they will not be used, so in the wizard the user can 'uncheck' "linq" and these specific files would not be included.