I'm METW but LOTRTW are welcome to use my downloads (with proper notice and acknowledgement).
The plaza atop a building is a funny one. Technically it may be possible but I believe the AI may get rather confused. I hit a bit of an AI brick wall with Helms Deep (which I've left so it doesn't become stale but will return to) regarding troops negotiating the buildings to get from the walls/gateway to the capture zone (namely that they just didn't move when controlled by the computer). Personally I'd avoid that and try to get the area as part of the map underlay.
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