Jesterhead wrote:I have a feeling that it was built from the ground up and shares very few frame parts with any factory vehicle.
More like Frankensteined out of whatever parts GM had lying around. Per the Wiki:
The current presidential limousine entered service on January 20, 2009. According to the manufacturer, General Motors, the 2009 Cadillac presidential limousine is the first not to carry a specific model name. The vehicle's outward appearance carries many current Cadillac styling themes, but doesn't exactly resemble any particular production vehicle. The body itself seems to be a modification of the immediately previous DTS-badged Presidential limousines, but the vehicle's chassis and driveline are assumed to be sourced from the GMC Topkick commercial truck. Many body components are sourced from a variety of Cadillac vehicles; for example, the car apparently uses Cadillac Escalade headlights, side mirrors and door handles. The tail of the car seems to use the taillights and back up lights from the Cadillac STS sedan. Although a price tag has not been announced, there is a rumor that each limousine costs US$300,000