This mech paper model is a Bushwacker, originally a failed BattleMech designed to have a smaller forward profile to make the 'Mech a harder target to hit, based on the video game MechWarrior 3, the papercraft is created by Shiftdel. The size of finished model is about 224 (H) x 220 (W) x 167 (D) mm.
The Bushwacker's unique design caused problems with the engine shielding, the side-effects of which manifested themselves as various gremlins in the 'Mech's on board electronics on the prototypes fielded during the Clan Invasion. The 'Mech was redesigned after schematics for an OmniMech known as the Vulture were captured during a raid into Clan territory.
Information gleaned from the schematics was used to overcome the aforementioned engine shielding problems. Finding the schematics had given the Bushwacker a second lease on life. Full production of the corrected Bushwacker began just after the Truce of Tukayyid, and the 'Mech has since become a favorite of MechWarriors in the Draconis and Capellan Marches of the Federated Suns. [Source: sarna]
You can download the papercraft model here: MechWarrior 3 - Bushwacker Free Mech Paper Model Download