rubber hydrolics?
Flexibility could be provided by some future thing similar to our current use of rubber instead of hard posts in hydrolics. With current high end robotics, this provides movement and resistance sensing. Provided the base is wide enough to support the sway of the mech's center of gravity, it could flex and return to central position.
The mech may also function more like a human in that it's central equilibrium system is never fully turned off. A sleeper mode for such a potentially small segment of the machine could be very practical. For full shutdown, it would have to return to the hanger docks or lower into a crouching or fully prone position. Crouching being preferred as it would probably also provide more foot and hand hold positions for the pilot.
