The livery is based on this pictures from a 3D Render from Audi:
I decided to recreate that skin on the Audi R8 LMS from Assetto Corsa's Dream Pack DLC 2.
Everything should be accurate, if not, tell me so i can fix it.
The skin has a size from 4096px x 4096px.
Just paste the file into your Assetto Corsa folder, the skin will be installed and should be ingame.
More skins from me and W.I.P. shots: