It is quite simple with those which are made undestructable in the game already - I don't know how to add more similar buildings or if it is possible at all.
I know that Forest Clearing and Warrior Hold are impossible to destroy, so the whole thing is to use these structures with their original names ( the names can be translated into something else, but the incoded name must be the same) for a different use.
There is one thing to remember the structures cannot be directly restricted to some factions, because this way they would be destroyed by anyone else.
So the structures must be made buildable by everyone and can't be limited to any specifick religion.
Still it is possible to limit their availability by setting build requirements - so only some factions would have the access this way, even if in theory everyone can build the structure.
In PMTW I have used Forest_Clearing as Trade Center - impossible to build ( the structure's building requirements are so limited, thet only one faction would be able to construct the center, but it already starts with one) and acting as another, more complicated resource i.e. in theory you can recruit Town Militia everywhere, but it requires Trade Center which noone really can build so its recruitment is limited this way.
Besides setting this structure as a starting one and impossible to build offers more opportunities than any ordinary resource e.g. it could increase mercenary magnetism, lower happiness ( so more soldiers have to be ude to occupy it) and do other things, even generate income if desired - however with the last thing there is a hardcoded limit which could cause CTDs if a province has too many different structures generating income as I have learnt to my cost.
Generally Forest Clearing offers many opportunities to use, I am not so sure with the Warrior Hold - I am not sure if this one is safe to use, besides for now I have no idea what to use that for.
Regards Cegorach
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