This information was also posted on the Atlas Forum, but since there may be a few people on The Railwire that do not follow the Atlas Forum, I will repeat myself here.
I received a couple of Mack R cement mixers arrived in the mail today, and even though I had the opportunity to inspect the pre-production samples last August in Denver, the production models have exceeded my expectations.
I cannot see anything on this model that is not new tooling. The tires and wheels appear to be separately molded pieces, and the etched metal West Coast mirrors are taller than the ones used on the Ford C. The air horn, fuel tanks and exhaust stack all appear to be chrome plated. The under body detail is all there, including at least the lower portion of the engine.
Athearn has created a truly incredible model! ;D
Carter