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.
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 :)