If you are friendly with the local Mercedes dealer immediately get an estimate for repairs from them and talk with everyone there. The insurance company will likely resort to asking them about value on an unusual car.

Years ago I had a VW Jetta diesel for sale when it got rear ended. Within 30 minutes of the accident, I took it to my VW dealer friend to show him. The next day, the other driver's insurance company called the dealer to ask the value. The dealer knew what car they were talking about, quoted them his retail price for such a car, and I got a very nice settlement.

In my past, I was a lawyer. My advice at that time would be to take your wife to the doc in the box and have her complain of neck and back pain, maybe a few contractions. You would be surprised at the efforts the insurance company will make to settle.

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1983 300SD "Guderian"
1987 MR2
2015 Camry
2015 Chevy Spark
2006 Hyundai Tucson