Megafactories program on the National Geographic Channel was about Jaguar's new XJ . This episode was giving out some cool facts on the leaping cat as well .
Whole aluminum body structure weighted around 300 kgs only , riveted aluminum technology borrowed from aviation , XJ means experimental Jag .
Jaguar engineers tested console instruments as 3D prior to producing the prototypes just like a flight simulator feeling .

Did they mention anything about the cool space age rattles that are driving me mad?!?

Nope sorry , they also didn't mention annoying popping roof issue . Normally you don't expect such irritating things when you buy something like this