I honestly do not see any resemblance of the SL. The Crossfire is way too stubby.
Look at the bright side. If DC shares parts with MB and not the other way around, the built quality of DC cars may just improve enough that they can turn their reputation around. DC does has some very aggressive body design, and I think DC buyers will not cross over to MB. Mercedes still helds the slob appeal that is not to everyone's taste.
It appears to me the Crossfire is to compete with the Lexus SL wannabe, I cannot remember what you call that turtle looking of a car now.

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95 R129
04 Infiniti G35.5 BS
10 X204