Wow. This thing is elaborate! (Word of warning, if you don't like dubstep or anything like it, you should just mute the video now. I personally like the song just fine.)
According to YouTuber nuropsych1, it took their team roughly two months on the Xbox 360's creative mode to create this beast.
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It would probably take longer to make it in real life, and quite a bit of money. So I expect I'll have one by the end of this year. Sound good, roller coaster maker people? Cool.
Thanks to Stan for the tip :)