I'm working on a uh60 Blackhawk. The problem is I need to give the main body a thickness. Extruding gives the object different thicknesses at different points. I want it to have the same thickness across all of the body. So for example, I might want to have a thickness of 5cm that is maintained for the entire body.
Here is a picture of what I want to make, that needs a thickness that is maintained throughout the main body: