Without getting the ban hammer slammed on me, I think I can say that there are several methods in making a mogul course
I believe what LF was alluding to was how others helped in making that course. What has always struck me is the length of the course with multiple lanes, some areas spaced them further apart so that you can't transverse into other lanes. I believe they keep them open and manicured by slipping them all season. You would never see this in the states, maybe they would leave a seeded course open but never manicured. The trails don't get enough bumps skiers skiing that direct line.
Just my opinion, one of the reasons skiing this type of line resonate in Asian countries (Korea and Japan) is due to the Buddhist influenced culture. One story I recall was that, "anybody can catch fish with a bent hook, it takes kung fu to catch fish with a straight hook". Perhaps a hyperbole but the context was that kung fu was a difficult task that took time and effort to master, its spiritual way of living.