OK...
I've had some success by placing the final waypoint on the land directly next to the target AND adjusting the other waypoints so that the missile approaches from overland (in this case, from the north).
Good enough to complete the mission? Probably not. The damage per hit is only around 10% and it looks like the triggers are set up to require all 3 buildings to be destroyed. I think you can get one.
As mentioned in the other post with the airport, the way to go might be to scale down the damage needed to about 25%.
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