This looks great. One bit of feedback I have is that this seems needlessly more complex than Basecamp (especially new Basecamp), which could limit its usefulnes

This looks great. One bit of feedback I have is that this seems needlessly more complex than Basecamp (especially new Basecamp), which could limit its usefulness for some people. One of my favorite features of Basecamp is that it's not opinionated towards one form of project. It gives you the ability to add anything to a project, whether it's dates, tasks, files, discussions, etc., but it doesn't show features unless you're actually using them. If you don't have any discussions in a project, it doesn't show a "Discussions" section on the project overview; just a small link to "add the first discussion" if necessary. Perhaps hide the more specialized features such as Reporting, "On Schedule" indicators, Clients, Invoices, due dates for projects, etc. until the user needs them for their type of project. This would make your product more universally appealing without sacrificing underlying functionality if the user wants it.