So pretty much as I anticipated then, fairly undoable even if you did get enough power to lift a heavyweight rated robot, and even then, I can't think of a way of righting a hovercraft back to the hover side in any sort of reliable method. Unless both sides were capable of hovering, and it just had a large spike or circular saw through the central part of it as its 'active' weapon.

Still a bit of a shame the general consensus is not worth it /impossible, as it'd be one hell of a neat looking monstrosity.