This paper model is an Onager Dunecrawler, from Warhammer 40K series, the papercraft is created by Patoroch. There are two different versions. These walker-engines possess a daunting amount of firepower for their size; so much so that the unenlightened men of the Astra Militarum often compare them to walking guns.
To the Skitarii, the Onager Dunecrawler is no mere weapon, but a walking reliquary protected by the Machine God. To the Tech-Priests, it is little more than a tool of destruction, albeit one tempered in the fires of history. The Onager Dunecrawler's various armaments can blast apart squadrons of aircraft, punch holes through traitor battle engines, or atomise enemy commanders in beams of blinding blue light. When on the hunt, their scuttle-legged gait and bristling appendages make them seem like predatory insects with a mighty sting.
The Onager Dunecrawler owes its origins to the Mars Universal Land Engine. Fashioned by the technoarchaeologist Arkhan Land, the original M.U.L.E was inspired by the bad-tempered, insectile beast of burden that its maker believed walked Holy Terra in aeons long past. The Dunecrawler of the 41st Millennium still bears very powerful weaponry, and the miniature fusion generator at its rear means it is able to outlast even the rugged vehicles of the Adeptus Astartes. Its guns are hard-linked to extensive databanks that can record its successes until it is as full as a tick bloated with stolen blood.
The Dunecrawler's modifications allow it to send this hard data directly to its masters -- and conversely to channel their imperatives to the Skitarii around it. The Dunecrawler holds two crew, enmeshed with their Onager host in a strange symbiotic relationship. Its gunner is a Skitarii Ranger, his formidable marksmanship bolstered by a variety of autoscryer lenses. The machine's driver is a Skitarii Vanguard, his resilience to harmful energies allowing him to immerse himself in an electro-amniotic tank that allows direct communion with the Onager's machine spirit. Such crewmen will eventually be used up in the manner of energy batteries, but these drivers are easily replaced – by inserting a new Vanguard into the filthy, electrode-rich soup, the Onager can be given a new lease of life. The Skitarii crewmen meet their fate uncomplainingly -- to serve the Machine God is reward enough. [Source: wikia]
You can download these paper model templates here: Warhammer 40K - Imperial Fists Chapters Free Paper Models Download [Box] [Gavitex]