You now should read a chapter through in its entirety. Read the introduction, each of the text chunks, and identify where any changes might need to be made in the introductions or Foreword.
You may even find that a new text chunk needs to be written to explain something that you now consider did not come up to scratch.Overall, this is your quality check on what you have pieced together. Now is the time to do this and not after you have pulled the book together.