I know now a rumer about the kenworth XF. It's a one-off mock-up. at the time the picture was taken it wasn't driveble. steering had to be done by hand turing the wheels.
If it was finished and made a runner I don't know.
I haven't been sitting still. the cab made out of parts is working fine the XF-euro6 and XF105 just differ in some parts.
grtz PetervR