Digital Trends | To refine the Cullinan SUV, Rolls-Royce unbridles engineering mule with ... Digital Trends Rolls-Royce is currently developing a “high-sided, all-terrain motor car” codenamed 'Project Cullinan' to do battle with the upcoming Bentley Bentayga. As part of the SUV's development process, the automaker has released photos of an engineering mule ... |