Dissertation Writing Style
Remember that your doctoral dissertation belongs to you.
Meeting with your prospective advisor will be important for narrowing and refining the central questions of your project.
Since he or she has most likely advised previous dissertations, it's also a good idea to ask your advisor to suggest a model dissertation that you can use to help realistically frame your own topic.
In your field of study, you will come to be identified by your project and may revise your finished dissertation to publish in article or book form.
But just because a dissertation hasn't been written doesn't mean it should be written.