Nice! He will, if he wants, be able to wander off (down the edge of the plant pot, e.g.); if there are no hazards (other pets, for example) or if this room can be closed off that might be fine, or you may want to consider setting up a barrier to keep him in the vicinity of his free range. I might also be inclined to put carpet or a pillow or something that would provide a soft landing under the bungee cord and any overhanging plant parts, so just in case he tumbles he doesn't crash on the wood floor.