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OmniFocus never creates a repeat of a task or project until you've completed the first one. There's also no way to make one task's deadline depend on when an earlier task was completed. So this can't simply be set up the way you describe. (And those are the two features you need to ask for.)
There may be some way to make your project work with existing features, but I'm not thinking creatively at the moment. Anybody want to chime in on that front?