If you want to use the energy stored in the rotation you&#x27;d need stiff tethers, not a slack line - more mass, shear forces acting on the tethers, can&#x27;t be reeled in. Moving to a non-rotating part of the ship requires a hub and a way to move to the hub - that would either require a space-walk up-hill against the artificial gravity (yay, climbing about a quarter of a km in space with an eternal fall if you loose grip) or a tether that&#x27;s massive enough to move through - but then we&#x27;re talking a very massive space ship, not about a rocket stage as counterweight.