This a thing that i like to do in minecraft. I call it Re-Block. The concept is that you take a build with not that much of diffrent blocks and then copy it by hand but replace every block with a other block that you chose. I have used MetalGearRex by byakudou. This is the link to his build: www.planetminecraft.com/project/metal-gear-rex-3371545

So try it yourself.