You could certainly create something in the shape of a blimp in the creator. You could even hollow the gas bag out to save a tremendous amount of weight. If you build something the size of, oh, the Good Year blimp, for example, you may have to 'over-engine' the thing to fly. It's certainly possible, but to look at it, it may look like you 'Tim Taylored' the thing just to get it off the ground.