This is not your regular papercraft, technically, cardboard is made out of paper so I guess we'll just say that it's a very very thick papercraft.
With SCEA's recent blitz campaign full of awesome Metal Gear Solid announcements, Kotakuite Kai-Hung "Chilli Coke" Chuang couldn't get enough MGS love so he had to create this 1:1 masterpiece. Pay attention to the detail, he really took time to nail every bit. If you want to create your own, the link to the original pattern is available below.
F#ck Metal Gear Solid Cardboardcraft [Kotaku]
Metal Gear Solid Papercraft [maquettes-papier]