I built that kit long ago. The version I had didn't have any plated parts, and there were no model plating services, BMF or chromelike paints. I had to use putty to put treads on the two-part plastic wheels, and everything came out great. Wish I had kept it.
The Monogram version of this is quite inaccurate. They just added a separate top to the cabriolet kit (which has different fender detail, among other roadster anomaliesplus different side louvers on the hood). You can see some of the differences in landman's post, above. The 500K coupe and roadster above are by Jo-Han and are excellent and highly accurate.