My first thought was--"This is a wierd question.
On second thought, maybe you could make a cardboard cutout in the shape of a tractor and make it to fit around the top of the cupcake which would be decorated like the big back wheel of the tractor.
Everyone could have their own cupcake tractor.
I've seen shows where they make cakes into cool things. I would get a picture of what I wanted it to look like, then get the cupcake and use icing to give it the colors and texture you wants. Plus you can add height and whatever else you need to do to make it look like the picture you have in mind.
I would definitely have a picture to follow to give idea's though,and the icing to give the height above the cake. The cupcake itself can be the main body of it. Sounds like a cute project.
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.