Hi, long time lurker here, first time posting. Just pointing out the very obvious here. The passage you cited says that 85% and 60% of the WEIGHT is RHA steel. That does not mean 85% and 60% of the thickness is RHA steel by simply multiplying the percentage of weight of RHA steel to get the thickness. For example, imagine an armor array of 1000mm thickness with 1mm RHA front plate and 1mm RHA back plate with 998mm of air gap in between. In this case 100% of the weight is RHA steel (air has no weight,) but you can't just multiply that by the thickness of the armor array and say that it has 1000mm RHA steel.