This mech paper model is the Atlas AS7-D, one of the four Founders BattleMechs 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 320 (H) x 240 (W) x 126 (D) mm.
The Atlas AS7-D is one of the most famous and feared 'Mechs of all time. Its Autocannon 20 alone is capable of crippling lighter 'Mechs in one shot. Adding to that the quartet of Medium Lasers and SRM 6, the AS7-D is a dangerous short to medium range combatant. The LRM 20 adds long range bombardment capability.
There are MechCommander 2 - Atlas Mech Paper Model, Ver.2, Atlas BattleMech Paper Model, MechWarrior Online - Atlas Mech Paper Model Ver.1, Ver.2, MechWarrior 4 - Atlas Mech Paper Model and BattleTech - Atlas Ver.5 BattleMech Paper Model on the site, and also a Classic BattleTech - Atlas II Paper Model available.
You can download the paper model template here: MechWarrior Online - Atlas AS7-D Free Mech Paper Model Download