Client Extranet

I am looking for a coder that has created a client extranet that I can put on my website. The extranet should allow me to give all of my clients logins to the website. Once they log in, they should be able to see an area that is dedicated to them. I should be able to share and comment on files, have discussions, and upload assets to this website. It should also have a basic calendar feature, contact information for my team, and allow me to communicate with my clients. If you have created one of these already, I would like to see it and if it works for me, I will customize it with you. Please respond with a link to what you have created or some detailed documentation. Please read the project first and write the word "Understood". Also write your steps and suggestions to complete the project with a short description of what you understood.