I'm thinking that the weight savings would be negligible with just the metal parts. For me, the Ti ProVari's really shine in 18350 mode, because of the reduced weight of the mod plus the weight savings of the smaller battery. A greater percentage of weight is shed, with the Radius, the overall percentage of possible weight savings with just doing the metal bits would be a very small number, for a large price increase. It would be crazy to offer it on just bling appeal without any substantial weight savings.