I believe so, yes. You can use creative mode, and create a ‘superflat’-type world (see https://minecraft.gamepedia.com/Superflat https://minecraft.gamepedia.co

I believe so, yes. You can use creative mode, and create a ‘superflat’-type world (see https://minecraft.gamepedia.com/Superflat https://minecraft.gamepedia.com/Superflat). And in Creative mode, you can give yourself an unlimited number of pretty much anything. But indeed, it was probably put together by hand. The creator might have sketched out or planned things in advance, but it would likely have been built by hand. The nice thing is, the design seemed pretty modular: A column of gravel, note blocks with a tripwire, and the different launchers to recycle the gravel. Test it with one column, then duplicate. I expect the hardest part would’ve been building the ‘ROM’ containing the song. Of course, you can also get Minecraft, download the world (link is in the video), and explore! Or you can find a third-party map editor/viewer. But that’s the best part, it’s all there to see!