I'm afraid heavy moving objects are a bastard to Lift, though I might allow something if you blew a ton of points into it.
Can you reflect the rockets- yes, using the alternate use of Lift; remember it costs your action and is no a certain deal, but it IS free. People with good Force Defence do that best.
The munitions are probably not weak spots- as for cutting off its legs, they are thick enough to the point whrre that would just be a dramatic representation of you killing it by inflicting enough damage, rather than being a way to kill it more quickly.