I don't like the Imperial or Portal Concepts. However, I agree with this article that all of the other concepts should have been built.
https://www.msn.com/en-us/autos/ent...ss-AAygb9R?li=BBnb4R5&ocid=spartandhp#image=1
https://www.msn.com/en-us/autos/ent...ss-AAygb9R?li=BBnb4R5&ocid=spartandhp#image=1