One idea that just came to me relates to the "pendulum fallacy", whereby people mistakenly think that a rocket is hanging by the nose from an imaginary string, instead of actually resting on top of its tail/thruster. So then, what if you could position a lot more of the rocket/lander's mass below the thruster? Then you really would have a little more basis for the pendulum paradigm. And a pendulum is a little more easy to balance on a vertical centerline than a pencil standing on its end is. So what if your rocket/lander looked more like a bell shape, where the thruster was located on the inside of the bell near the top, and the fuel tanks with their propellant mass were located on the outside of the bell near the bottom? Wouldn't that type of mass distribution make it easier to do your balancing act, since your vehicle's mass distribution would be helping you rather than working against you? Comments? Thoughts?