Rent-A-Car Project Documentation

I've got this project includes both practice and documentation. The programming part is already done, but at the documentation step of the project, I got stuck. The documentation part needs to be at least 50 pages, and the content subjects are listed as below: 4. Contents: 4.1. Introduction 4.2. State-of-the-Art and trends 4.3. Formulation of design structure 4.4. Basic theory, analysis, synthesis, hardware and/or software development, design, block diagrams, justifications (as applicable!) 4.5. Experiments and analysis 4.6. Conclusions 4.7. Others (if applicable)