Check out this mech, a robot which built from an old broken down Nissan truck. It is about a ton worth of other metal scraps. It stands at 12 feet all and took about a month to complete.
“I disassembled my dad’s old Nissan truck which he doesn't use anymore. But it’s not enough so I also went to a car disassemble center many times to buy mechanical parts. I probably bought over one ton stuff I think. It takes me almost a month to put them together, lots of fun.” The inventor said.