In Pixar's Cars universe, the cars themselves creatively construct buildings and other structures. It's a fascinating process that requires a suspension of disbelief as these vehicles, despite lacking human hands, expertly use their tires and various car parts to achieve construction tasks. They manipulate objects with great precision and coordination, utilizing their side mirrors, antennas, and even their tongues. They also use specialized equipment designed for their unique needs. While it's a whimsical concept, it's a testament to the creativity and imagination of the Pixar team.