I think my pic isn't working because it links back to something already hosted on VK (although it displays fine on my screen, likely because of the cache). But if you've seen that 1949 prototype set, you know what I mean. I'm aware of your CPA set, and read the thread with much interest.
However, I'm thinking much earlier but still in the all-electronic era... Perhaps to a time when we wouldn't even recognize some of the components. I think there were some early concepts that contained three guns in separate CRT necks, firing at a common screen... Far out stuff like that.
I'll check through those websites again, there may be some updates since the last time I looked.
A "parallel universe" of sorts exists in the automotive world, with people rendering what-if concept car ideas, like a contemporary full-sized Mercury coupe:
Sort of like a stillborn museum of failed early color TV ideas... If that makes any sense?