But DF's value system is unfinished and instead of taking into account quality and scarcity, you'll still have these ostensibly sophisticated civilizations using stuff like copper armor at the same ratio of steel armor, which in my opinion totally breaks immersion.
I think it should be possible to do what you're trying to do (or at least my interpretation of what I think you're trying to do
)
I haven't actually tested this but I've done similar things and in theory it should work. Basically you need to get rid of all of the
hard-coded reactions and items by deleting them from your high-tech entity, then write new ones by hand.
Once you have total control over the reactions that are available to your high-tech civ, it should be as simple as limiting the output
of the reactions to the materials and items you actually want. In WC your people might still try to shove copper bars into your fancy new
custom forges no matter what you do but that doesn't mean you have to let it affect the output.
For example:
[REACTION:MAKE_STEAM_ARMOR]
[NAME:steam-powered power armor]
[BUILDING:FORGE:NONE]
[REAGENT:A:150:BAR:NO_SUBTYPE:METAL:STEEL]
[PRODUCT:100:1:ITEM_ARMOR:ITEM_ARMOR_STEAM:INORGANIC:STEEL]
[SKILL:FORGE_ARMOR]
Edit: The download link in the OP is dead