The 004C from Scuderia Cameron Glickenhaus is the only vehicle in the GT class to be based on a carbon fiber monocoque. This vehicle has been designed to comply with the GT3 regulations that is a category of vehicles derived from road legal versions. The car is created to compete in the most iconic endurance races, like the 24 hours of Nürburgring, requiring a high level of engineering technique and experience. The monocoque together with the roll-cage are responsible for the safety and the dynamic performance of the vehicle, giving their contribution to the overall torsional stiffness. This document will go through the design flow used to design the carbon fiber monocoque explaining the complex mix between costs, weight and performance targets along with regulations and safety constraints.