Right now such technology is impossible. The closest thing we have are hovercrafts.
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$11 million
To get R2D2 is robot + star wars
jedi + sith = star wars
Limited Opening Weekend: $1,554,475 (#1 rank, 43 theaters, $36,150 average)
3D effects are actually done by a computer. So they would make the entire film into a 3D version.