What goes into building a bobsled?

In 2010, the United States Four-Man Bobsleigh Team raced to victory in their sled "Night Train," winning the gold medal at the winter games in Vancouver, Canada. Led by driver Steve Holcomb, Team USA will attempt to win the gold for a second time in Sochi, Russia. Their secret weapon: "Night Train 2" - a technologically sophisticated bobsled created by the Bo-Dyn Bobsled Project using SOLIDWORKS 3D CAD software.