I'm sure others will comment on this. I re-lettered a diner with "BURLINGTON" on the letter board some time ago and changed the name of the car to "SILVER FEAST" which was used on the Twin City Zephyr, as well as in pool service. Unfortunately, none of the dome cars, including the observation car, match the TCZ.
The CZ dome observation cars had the dome toward the rear of the car, which was unique to the CZ. The other name trains, such as the Twin City Zephyr had the dome located toward the front. And of course the Denver Zephyr, and others had a blunt end observation car.
If only Atlas would come out with the blunt end Denver Zephyr observation, now that would be a great model to have, but I doubt it will happen, especially at this time.
RAY