Here is a GM clay model for the 1961 Chevy, also from 1959. I can see the bubble-top styling. I don't know about you, but I'm glad they went with the more traditional 4 headlamp layout. But the rear end just really looks like a production 1961 full-size Chevrolet.
![image](https://americap2.nyc3.digitaloceanspaces.com/upload/photos/2020/09/Btjd2FcIPqw8N28zvan9_05_874573d999a02fa6f6c0dd3253194980_image.jpg)