Thrift model and XX
The Thrift model weighs the same as the E - the body material, size & thickness are the same as the E - the only thing lacking is the halo.
I have never weighed the XX but I suspect it weighs about the same as the XXX, about 20 lbs, since there again it's really the same machine as the XXX just different "skin." The reason the Model S weighs so much less is because the body is made of thinner-gauge metal. It is so light, yet so powerful, that if you take off the front cover and back, turn it on and stick to a smooth wall, it will stay there!