This mech paper model is Raven, a mech from the free-to-play vehicular combat video game MechWarrior Online of the BattleTech/MechWarrior franchise, the papercraft is created by Parman01. The size of finished model is about 175 (H) x 100 (W) x 135 (D) mm. There is also a MechWarrior 4 - Raven Paper Model on the site.
You can download the papercraft model here: MechWarrior Online - Raven Free Mech Paper Model Download [NoLines]