MVC PHP Folder structure for scalable web apps

I have been thinking long and hard about MVC and how to create a scalable web application, where it would be easy to change business logic, implement new modules and so on. But im stuck on the Admin/Public part, Views vs. templates, and Domain Business Logic vs Services, modules (i decided to call this one modules instead of application, since application is the whole thing, and by module i mean: forum, blog, chat, ticket support system, products, etc) and last but not least API. In my currently rather narrow understanding, the folder structure could be:

Application
   Administration
      Controllers
      Views
         Templates
      Models
         Domain Business Logic
         Data Access & Storage
         Services
            Modules
   Public
      Controllers
      Views
         Templates
      Models
         Domain Business Logic
         Data Access & Storage
         Services
            Modules
   API

What do you guys think? Does this look okay? I really want to know if I understand this correctly.