Actually, no.
I will make one suggestion, which is to change the name, corrugations and roof to match on of the Budd-built "Pine" series cars:
Pine Dawn
These cars are almost spot-on for the source material you are working from.
More photos:
Pine Dale
Pine Gem
Pine Grove
Pine Leaf
Pine Mesa
Pine Dale
Oh, and get rid of the red lights on the end. Those weren't added until after 1980 or so.