Well, the pieces are a bit jumbled(Not homogeneous) and lacks more "extras".
This is what I was thinking.
It is a military tank, but it looks like it was made by a rebel who threw sheets of metal together.
I understand the simple part, but if a tank looks unstable like it was made of flimsy sheets of metal, that is not very tank like. Tanks are supposed to look strong, and every piece should make it stronger.