The bad news is: I can't figure out how to get the scenario intro working.
The worse news is: the scenario is slow as molasses to load, and it's not even finished yet; I'm terrified that once complete, it'll literally crash the game from being too unwieldy.
I'm not quite sure if it's just the sheer size of the map plus all that's on it (fully possible), and/or (they're not mutually exclusive) just coding incompetence on my part, where there's clutter that doesn't need to be there. Basically, to do what I need to do, I'm not sure what needs to be there and what doesn't. I'm positive I have a lot in there that doesn't need to be...but I'm not sure what I can safely remove, and what is absolutely critical to keep where it is, as-is.
It's not all bad news, though.
One, I am 90% sure I know how to fix the city resource display problem; I found a promising variable. Art->city screen->luxuryicons seems to be the culprit. Of course, knowing where it is doesn't fix the problem; no scenario actually would contain the solution I'd be after, because I invented half of the luxuries I used. (Well, not really--I turned existing resources into luxuries. Olive Oil, Wheat, "Whiskey"/Sake, and Wool; Sake wasn't originally on the map and Wool is the only on-map one which was always a luxury.)
Two, I am 90% sure I know how to add the music into the game!
Turns out that, as I had hoped, there's a notepad file called Music, which lists the music used in the scenario, in the order it is used.
I'm not quite sure how much tinkering it'll take to get it to work the way I want it to, and want to table it for a while, but I at least know what to do when I get around to doing it.
I decided to take a break from map-building and start getting into unit-making. Made five...
...And have by my estimate around 300 or so (give or take) left to add in, not to mention edit the existing ones. (I'll do the editing of the existing ones as I'm going along, though, when it's appropriate to do so.)
This will take a long time, though, so I'm doing it in moderation.
Progress is happening tho!