I think you need to do some more refined sketches before you go any further with this. Show us a clear and organized concept sheet. Outline each upgrade stage of the turret.
Because the first post was updated and is now using jackablade's image :D As for the sketches, they are still sort of hard to understand. Try to make them slightly bigger so it's not as cramped together. edit: By this I mean making the actual drawings again and drawing them bigger. Not that the image is to small :p As for…