Shortly after stylists penned the first design sketches, Holden engineers began work on developing the chassis. Opel, which had provided the basis for all previous Commodore generations, ceased production of their rear-wheel drive Omega in 2003.Robinson (2006), p. 34–35. This meant that Holden had two options: to use another GM platform, or to develop an all-new vehicle. GM's new premium rear-wheel drive Sigma platform was to see production in the 2002 Cadillac CTS. Holden's engineers were offered this platform, but decided it was not appropriate.Robinson (2006), p. 53. The Sigma platform's double A-arm front suspension and extensive use of aluminium were too costly for the VE's market segment. The luggage compartment was deemed too small and the Sigma interior package could not be stretched sufficiently to become a family-sized car. In particular, the rear-seat shoulder width was too tight.McCarthy, McKay, Newton, Robinson, p. 31. These major drawbacks made Holden decide to develop an all-new platform, known as the GM Zeta platform, on which a number of forthcoming GM vehicles would also be based.Robinson (2006), p. 55–56. The Zeta suspension system comprises new double-pivot MacPherson strut for the front and a four-link independent rear setup. These replace the previous simple MacPherson strut design front and much criticised semi-trailing arm rear suspension, for improved ride and handling.Butler, Dowling, Hagon, Newton, p. 30.
