Have a nice 2009 Mercedes SLK that I did some work on for circuit racing but now I'm thinking of a more dedicated circuit car project so a Crossfire is a possibility although the Merc is a keeper.. In my country it's all about what's available rather than exactly what I'd like. Covid here has given some sellers delusions of value if you get what I mean. A Crossfire coupe with it's solid roof should be stiffer than a R170 Merc so that's a plus. Meanwhile I'll just browse here and maybe make a comment or ask a question.
One thing I would want to do is replace the recirculating ball steering with a rack and pinion but I'm guessing that stuff may be in the way. As it tends to do.

 

Welcome over to the dark side There's a lot of complaints about recirculating ball steering box, but IMHO, that is not the problem with the steering, but rather the more traditional steering box and linkage system, vs rack and pinion. Now, having said that, the steering is far better than people credit it for, and it seems more like car critics needed something to complain about on the R170. Sure, the steering is a bit more vague than a rack and pinion, but it is also smoother, and less prone to severe bumpsteer (provided the rest of the suspension geometry is correct).

But I digress. We have sections to discuss this further. In the meantime, glad to see you over here!