Adding an folder to a multiple project Visual Studio 2010 Template

I've been working on a full vertical stack template for Visual Studio (It's on Github if you'd like to help out: https://github.com/Adron/infrastructure

My problem is, I have not been able to add a folder for assemblies in the root of the solution. The individual project templates (which I have three in the overall parent solution template) have many individual elements, such as files and folders. But when I try to add anything like that to the parent template it reports that it is not valid in this XML schema/file.

My current solution XML file looks like this:

  
    ASP.NET MVC 3 + Razor + Machine.Specifications Infrastructure Solution
    This Visual Studio Template provides the following pieces for getting a kick start when building well designed web sites using good patterns.
    true
    true
    true
    Icon.ico
    CSharp
    1000
    true
    Infrastructure
    Enabled
    Preview.png
  
  
    
      Web\MyTemplate.vstemplate
      Specifications\MyTemplate.vstemplate
      Data\MyTemplate.vstemplate
    
  

Any ideas on how to add folders or individual assets? Thanks...