First I have another sl600 listed, I think you would want it also, should go cheaper than the parts that are on it.
I have had this car 5 years it's a California car, ac doesn't work, radio not working, hyd top need rebuild, headliner sagging, will throw a check engine light secondary air pump, other than those things it runs good 13.52 at 105 quarter mile and speed limiter works at 155mph. The 12cyl experience is worth the price of what I expected it to bring.
I will answer questions about the car it's been a great car.