I cant find the pointer in the game's files that tell it to use the custom map created for Kyoto. The other citadels in the game are just upgraded versions of whatever they start out as. None of them end up looking like Kyoto. Thus, it uses a special map (the custom battle one).
I came across the thread that talks about using a script (and how it doesn't work) to put TEd created maps into the campaign. Shame. But, the game uses the Kyoto map for the Kyoto siege. Therefore, couldn't it be possible to use whatever formula the game uses to have a custom map for another castle?
Essentially, my end-goal here is to take a recreation of Wakayama castle I'm working on in TEd (modeled after what that little display in the glass case on the top floor of the present-day castle says it looked like back in the old days) and assign it in Kii for use whenever Wakayama's under siege (regardless of how upgraded the castle is).