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Interesting ideas. A tip about resources costs :
The pinned "Equipment list" thread shows the resource cost of each weapon and piece of armor.
In game the formula for resource cost of unit is mainly "sum of equipment costs", but is adjusted/multiplied or mounted or giant sized troops.
This resource cost per equipment is important because protection is not all : various armor types give more or less encumbrance for the same prot value, shields give defense, etc ..