You can see in the video that nearly every part of the Kawasaki is made from either cardboard or tape. It does look like there are a few bolts holding some pieces on. He uses scissors and knives to cut the pieces into place. A lot of the parts are functional, too. Just look at the movement of the mono shock or the way the gas cap actually locks into place. It's not some half-assed model either. It's very obviously a motorcycle, not a giant cardboard lump.
Unfortunately, no one at Autoblog speaks Portuguese, so we can't understand what Arruda is saying in the video. Either way, this is pretty damn cool. We're hoping the follow-up to the cardboard Kawasaki comes with four wheels rather than just two.