Just want to illustrate ideas from chat about perk system and spells: maybe it's better to just make spell_trees (like in Diablo_2 or smth) where most of spells require perk equivalent to work (one perk can be used but many spells). Also it should illustrate possible spells, that we can take from Skyrim (including using spell_effects of shouts). Most of suggested spells sure can be made (they exists in mods or can be made obviously as combo of common spells).
I made structure of 3 skills for example.
Smitehammer propose to add some automatic progression perks in all skills that would give effectiveness cons (such as additional damage by archery or so).
Later i'll add more info on proposed spells.