Original: For budgetary reasons, a gimbal and CGI, much like those used in the pod race in Star Wars Episode I: The Phantom Menace, were quickly ruled out, creating a challenge for the production team to find an alternative.
Simplified: Because it would cost too much, a gimbal (a hydraulic turntable) and CGI, like the pod race scene in Star Wars Episode I: The Phantom Menace could not be used.