About midway through a first draft, I usually take a breather and fix all the broken parts of my design documents. Yes, the design documents are not perfect. The design documents are not fixed in concrete, saints row the third save problem are a living set of documents that grows as you develop your novel. If you are doing your job right, at the end of the first draft you will laugh at what an amateurish piece of junk your original design documents were. My attitude is hte if it works for you, then use it.