It is important to understand the nature and maturity of the organization you plan to create this appraisal kit for. This will decide the depth to which you would like to go. For example, 360-degree feedback is something everyone will talk about, but if there is no system in place and the environment is not mature, it will fall flat and be used as an opportunity to vent ire rather than provide real 360-degree feedback.
Having 80 pages is also too much for anyone to read and retain. Try reducing the size significantly for better impact.