Something I've been wondering for a while is if anyone has or knows if it would be possible to mod SC3000 Unlimited to have a combined North American, European, and Asian building set.
I'm not sure if such a thing could be done. I imagine it would require one building set to somehow be tripled in size to contain three copies of all its own buildings. Then the buildings of the second and third copies of the original set could be replaced with their equivalents in the other two sets. Ideally, this would even allow placement of different-appearing, functional police stations, museums, etc. even if using the plop cheat was needed for these civic buildings.
There was some discussion I found online from over a decade ago about screenshotting each building’s four sides in-game, editing out the background, and importing them using SC3URK, but that's discouragingly tedious and would require either replacing a set's own buildings or adding them as functionless landmarks. If only there was a way to alter the game's files to pull this off without such an exhaustive workaround...