If you're going to cover the seat in a fabric that's different from the rest of the sofa it would look better to recover all of the seats. I think you can get away with covering only the top section though.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.