Document Manager on Google Apps

I have put together some apps scripts , and conventional HTML/JS/jQuery web application to form a document management system for small business/non-profits. Because it uses the underlying access control of Google Apps, users can approach the managed documents either from the Google Drive interface or from the customised business interface.
The application implements organisation-wide business rules to files/documents stored within Google Drive. Essentially, it ensures that documents are named, shared and retained according to the enterprise rules for record and document management.
In the current implementation a particular business information entity type (eg Clients) has its access controlled by administrative divisions (eg Regions).
A nominal user (DocMan) is assigned ownership of all documents and regular users get access to the documents according to their membership of user groups. Effectively, the normal user asks DocMan to undertake administrative actions through the application.
The organisation can specify a fixed structure of folders and the name of the root folder. Access control is handled exclusively by the standard Google Apps Users, User-Groups and Sharing mechanisms.
The diagram below outlines the relationship between folders, documents, users and groups used with the Document Management Application.

More on Google Apps Script HtmlService performance

Following on from the post where I identified some performance issues with HtmlService there are some additional 'best practices' to be considered for performance reasons.

• Minimise number of source files css and js included in the html. The initial load time is sensitive to the number of files to be processed.
• Avoid source file loads of css and js on client side. These end up as serial operations (in contrast to the usual parallel browser operations). This is a significant factor even if these url are cached.
• Avoid un-cached images (icons and the like). With references buried in css and js files, these seem to take a long time to load and also fall into the serial operations category.

If you are using Twitter Bootstrap or similar toolsets, this is hard to achieve. Repackaging the css to enable fast loading undoes most of the benefits of using Bootstrap :(