The initial modeling tutorial did not show any reference images. So I did not have anything to refer to until after I completed the model. I went back and rescaled things as best I could without rebuiilding the entire model.
I did build the guns a little oversized just because I like BIG GUNS.
I reduced the size of the rivots by 30% but I am keeping the big guns
Thanks for the input. I have lots more detailing to do.