Hi Wingman,
I did similar with a product I purchased called webdev docs. I am in the process of using Joomla with ProjectFork to turn each client site into a project with milestones and tasks. That way the project team - me and the relevant client contacts - all have access to the information.
Will save me a few phone calls as every update gets emailed to the group
As super admin I get to see all tasks for all projects so i can see how late I need to work, or not, as the case may be.
Regards