Watched this on Motors TV at the weekend. There was a big R8 LMS smash as well.
YouTube - R8 Crash @ ROC 2010
MY15 8V S3 Sportback with options
The owner of that S1 must be in for a big bill; I quess you can't just order a S1 bodyshell from Audi
Maybe you could take a S3 and chop 6 inches out of the wheelbase?