This is Mg Rex from Metal Gear Solid series. Requires 5 sheets of paper and no assembling instruction. Got to figure this out yourself . It looks easy to build tho.
MG Rex is the metal gear that Snake found in MGS2 inside the ship. He had to sneak inside the ship and took picture of rex to show proof that Rex does exist.
Rex info was leaked by an insider name Emily.
Later Ocelot came in and took Rex away while the ship sank .
The picture of finished Mg Rex is by steel serpernt . Password is mypapercraft.net