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You could use the copy option to copy one piece of terrain to another side, that's the fastest way to create terrain, specially for large maps terrain.
Most people would do this, problem is that getting your hands on one is quite hard. (provided that you want it to be on a decent level anyway)you hire a terrainer, so that you won't have to do it yourself.
I got my hands on Heinvers through simply sending a PM, though he was quite less famous back then so it was less competition.