Spaceship

To create a UFO for my alien scene, I chose to use 2 cylinders. I initially created one, converted it to an editable poly, and extruded the edges inwards, creating a saucer shape.
This shape was then duplicated, and placed on the top of the other shape, creating a flying sucer shape. The upper half of the saucer was adjusted to make it slightly taller, so that the UFO looked a more like a cartoon one.
Below is the result of this process (note that the image has not yet had textures applied to it):
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