Ok, so I'm thinking, how about ditching the 'orbital' shovel design in favour of a linear actuator lifter, one that just runs through the middle of the robot. Pretty much the same design, but the arms won't be on the outside, so won't be easy to tear off, and I should have plenty of power in a linac. Any thoughts? Too slow? I guess it'd kinda be like Ricky's lifter, hinged somewhere near the back, but the linac would be attached at the middle, I guess.