This will be incredibly hard to balance out and expensive to assemble. some of the materials you need are very exotic, and software you need is somewhat similiar to the one that is used to land spaceX rockets. And on this, bigger is easier so it will be alot harder for you to balance this(you will need alot of different sensors.) and you will have pair of it. It is far from users G point, so my recommend would be an exoskeleton to the Gpoint atleast(which wont be nearly enough and add alot more weight but its something and you will have extra space).At which point, it wont be pair of shoes anymore. You should aim to make i work in theory first, then simulations. But my opinion is its practically impossible.