besides that that is one nice model!!! you should select the lower body and lower it, but keep the lights[halfway through the windshield and up] in the same spot so the mid body of the car gets lowered and the windshield looks taller on the Y axis.
if you want to get rid of the barrel. extract the barrel model, then open it up in whatever prog u use. then at the top click select all, then go to scale and put all the settings to 0