Here are some design sketches I found of it. 

Audi-R8-GT-Spyder-Design-Sketch-4.jpgAudi-R8-GT-Spyder-Design-Sketch-2.jpgAudi-R8-GT-Spyder-Design-Sketch-7.jpgAudi-R8-GT-Spyder-Interior-Design-Sketch-1.jpgAudi-R8-GT-Spyder-Design-Sketch-5.jpgAudi-R8-GT-Spyder-Design-Sketch-6.jpgAudi-R8-GT-Spyder-Interior-Design-Sketch-2.jpg