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Nesting Roll ups - is this possible?

I am trying to create the following structure, but I want the Actual and Estimated time to be rolled up to the top level object e.g.


Projects -> Milestones -> Tasks -> Times 


Task holds the Estimated Time field and Time has the Actual time entries, rollup is simple enough there, however it appears you cannot roll up the Est + Act time to the Milestone or to the Project


Essentially I want to be able to look at a project (high level view) see what the total estimate was and what the actual is so see how far we are off completion. 


Am I missing something here?  

Any luck?

I'm trying to do the exact same thing with estimates and actual time.