Web Joomla Solution (Extension or Development)

Web Joomla Solution (Extension or Development) I am insurance agent and I need an Area in my Joomla site for my clients, where they can access to our website through their login and password (joomla ACL) and then thay can check their insurance policies. The Insurance policies that may review or download should be only links to Dropbox, Google Drive or any storage service (I´m using Zoho docs, but this is not a must). I only use pdf format for those documents Of course users will only be able to see their own documents and not all of our costumers. I have almost 500 costumers and about 1000 insurance policies, so our administration should be easy. I mean the way we are going to upload each document and assign the view for each costumer ** Any customization of an existing joomla extension would be great for me. Because they usually do more what you need and it could be future possibilities. But a well known one