I built a Fairey Rotodyne in minecraft. I'm not going to explain what a rotodyne is, since you probably already know if you found this, but here's the wiki for the rest of you. If you can't be bothered to read, here's a popular video on the subject.
I used binvox and viewvox to create the plans, built it mostly by hand, used worldedit for repeat processes, like coloring and copying the rotor blades around.