Accoriding to my sources this 7er mule IS NOT caring underpinnings of a baby RR, but of the "new 8er" Gran Turismo.
Mind that CS Concept has almost same wheelbase length as E66! Approx. 314cm.
While the RR Phantom (SWB)'s wheelbase is 357cm, and baby RR's wheelbase will be approx. 325-330cm.
Baby RR's will feature ALU spaceframe like Phantom, and will appear in the streets as an original RR testing prototype (with heavy camoed original baby RR body) - and not as eg. 7er miule, despite featuring same suspension solutions as F02.