This mech paper model is Cougar, a mech from the video game MechWarrior 4, the papercraft is created by Shiftdel, and the scale is in 1:40. The size of finished model is about 175 (H) x 172 (W) x 114 (D) mm.
After the Refusal War with Clan Wolf, Falcon Khan Marthe Prydedecided to upgrade the 'Mechs her Clan fielded as they rebuilt. Rather than waste precious resources designing a new OmniMech from the ground up, she instructed her scientists to improve upon existing designs. The design the scientists chose to modify was the Adder. Though the two 'Mechs are visually similar and share the same weight, the Falcon Cougar is slower and better armed, though it only has five and a half tons of Ferro-Fibrous armor. This process enabled the Falcon scientists to produce a new design in roughly half the time it would have taken them otherwise. [Source: sarna]
You can download the papercraft model here: MechWarrior 4 - Cougar Free Mech Paper Model Download [Skins]