During the design phase of FSAE, dozens of different components, parts, and mechanisms have to be fitted together onto one assembly. As one can imagine, this process can easily devolve into chaos if the designs are constantly changing.
To keep the design workflow streamlined, an unchanging core design must be established which other components can be based around. This core design is the chassis of the vehicle. As of November 1st, the design for the chassis has officially been frozen; no more major alterations will be added, which will allow the other teams to assemble their components and parts into the master assembly.