As a matter of interest, did AutoArt produce any other versions of the car?
I am thinking of the colourful Jagermeister version, driven at least once during the year by none other than James Hunt!
Perhaps they would consider an alternative race event for the works cars such as the #12 winner of the Nurburgring touring car 'GP'.
The cars were also run with little or no bodywork changes by private teams in 1974 - including a nice looking blue Gitanes sponsored car.
AUTOart has many variations of the CSL, both street and road. Diecast.org's historical website (which is far from complete, but still a useful starting point for indentifying older models) shows several that you might like:
I found this 3.5 CSL on eBay by searching for "1/18 BMW CSL":
There is a listing for a '1972 racing CSL' on there, even though the winged car didn't appear until mid way through 1973.....
Oh, and I bought one of these green Gosser Beer models on e-bay around 4 years ago. €90 plus shipping.....
I am seriously considering the Hermetitie version when it arrives. Like the green version, it is also a race winner.