These amazing designs are by Warren Zoell of a Post Apocalyptic Era…. which we may see sooner than later! Excellent work!
The two main things in my opinion that are important when creating post apocalyptic machinery is that it must look like it was put together piece meal, as one would expect to see in a post apocalyptic environment. The second thing is that they must have a face. I feel it gives an addition of character to said model.