This mech paper model is Raptor, began as a proof of concept design by Luthien Armor Works that turned into a respected recon and fast strike OmniMech, from the game Classic BattleTech, the papercraft is created by Yogsolthan. The size of finished model is about 165 (H) x 117 (W) x 123 (D) mm.
The Raptor is built on an Alshain Type KR140 Endo Steel chassis and uses a weight-saving Omni 175 XL Engine, which gives the Raptor a top speed of 118.8 kph. Three and a half tons of armor provides protection to the Raptor from most light weapons. The Raptor relies more on its speed than anything else to protect it from taking damage, as its armor protection is thin. [Source: sarna]
You can download the papercraft model here: Classic BattleTech - Raptor Free Mech Paper Model Download [Skins]