I think u made a mistake with the Sabot firing and the Cannon the cannon is supposed to have a bigger radius
the 2nd part of the shell is also fired with the sabot but braks away when it leaves the cannon the reasaon for this is that you can also fire explosive munition this way through the same cannon
yeah it also think about a weight equalization device i mean look at us humans we move our arms when walking and we move all of our upper body just look at how disabled move and then at how normal people move and youll see differences a weight equalizator would be cool