I've already tried doing this with my "Mega Modpack". One of the mods separates the armor and weapon techs. It's an easy and simple fix BUT it doesn't override the CORE XML data which makes it require all the weapons. This won't be possible until we can properly regenerate the data.zip (without problems) or override the default game settings.
You could fix this (I've successfully gotten mine to work) but you have to reload the data.zip which regenerates all the gamecode. The problem is that the CoreKingdomStructures.XML have some MAJOR building errors and duplicates which will cause some problems for you... major problems.
Also, it shouldn't matter if it's in the "Units" or the "Mods" folder as long as you have "Mods Enabled".
