I'm still coming up with an issue with this in the sense that I still cannot build the improvements, as it still says that my faction (kingdom) cannot use that resource.
does anybody know how to remove the faction restrictions on resources so that you can actually build the created improvements?
End of dingbat91's quote
For the most part, you need to start a new game for mods to take effect. That could be your problem.
For removing the restriction entirely, you would just need to remove the following code from the buildings themselves:
<Prereq>
<Type>Allegiance</Type>
<Attribute>Empire</Attribute>
</Prereq>
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However, Elemental can be kinda weird about how it handles Attributes such as <Prereq> or <GameModifier>... because you can have multiple of them on the same item/building/whatever, they could end up stacking instead of overwritting like you'd want to...
I think you can use the /createxmlbinary command on an executable to fix this issue, but not sure...