[tinkthank]

OK thank you very much.
After doing some more tests, it looks like I actually cannot do more than half the things I wanted -- my mod will end up making a fairly vanilla-flavored nation without other forms of modding capabilities (castle defense bonus, terrain-coupled abilities, summon allies, etc.); I will work on it, but quietly, and without pretense of finishing it for a while. But thanks for the help until then!