This livery is in fact a real one. The car comes from Belgium and was displayed in a Gumball event.
The SLS coupé is very different from the original McQueen but strangely enough the paint job looks good on the Merc. The car is quite fun to drive in AC, so the look suits the model even better. Ka-chow!
Download link: http://goo.gl/B4PxaH
Due to a change in v0.55 version of the mod, the couple of Ginetta skins was updated (in order to match the new aerocatches and Ginetta badge). You can download them again at the same links.
Another skin for the Ginetta G55 mod in Assetto Corsa.
Download link: http://goo.gl/PmdXOE
A skin for the new Ginetta G55 mod in Assetto Corsa.
Download link: http://goo.gl/GyH9qs
If you want to play “spot the difference”, there are a few pictures on Tolman Motorsport’s site: http://www.tolmanmotorsport.co.uk/index.php/tolman-motorsport-racing/tolman-motorsport-race-gallery/64-ginetta-gt4-supercup-silverstone
Another link, if you are curious to see the original design by Chris Warner: https://www.behance.net/gallery/19266131/Ginetta-G55-GT4-Supercup