So I watched this videoand you see the mech is modeled out of iron blocks and clay. and my question is how does the command block do it? I it armor stands? If so how do do it quickly?
Please answer. Thank you.
The model itself is not created using commands, but a custom resource pack that it has you download. Inside the resource pack are the files for the models:
Without the resource pack, the mech is just a diamond hoe:
You can create them by hand (see this wiki page on model format), but to do it "quickly" you'll likely want to use a tool.