This mech paper model is Warhammer, a mech from the game Classic BattleTech, the papercraft is created by Whammy. The size of finished model is about 226 (H) x 137 (W) x 160 (D) mm. There are 1:60 and 1:120 two scale versions available.
The Warhammer BattleMech was introduced by StarCorps Industries in 2515 to be "a mobile 'Mech with enough firepower to destroy or severely damage any 'Mech of the same weight class or lower." In the mission it was designed for, the Warhammer proved to be a very capable 'Mech, and for centuries practically defined the entire class of heavy 'Mechs. Boasting incredible firepower and respectable armoring, the Warhammer served prominently in the Star League Defense Force and was one of the premier 'Mechs in the Gunslinger Program. Indeed, many of the greatest MechWarriors in history were Warhammer pilots.
After the fall of the Star League, the Warhammer continued to serve in the armies of the Great Houses during the Succession Wars. Its longevity was helped by the large number of Warhammer factories spread across both the Inner Sphere and Periphery, despite relatively low production rates; Ronin Inc. was never able to build more than five Warhammers a year from their Wallis factory. The recovery of the Helm Memory Core would spur on the creation of many new Lostech-using Warhammer variants by Inner Sphere manufactures, while the Periphery continued to build original models for mercenaries and black marketeers.
The design found a new lease on life after the Clan Invasion when StarCorps decided to revitalize the ancient 'Mech with the latest in technological improvements. Initially the company was to build just one new variant from its Crofton plant, but as news of the plan spread other departments within StarCorps began to involve themselves in the program and descended upon Crofton for a week-long conference to hash out the particulars. The conference ended up being more celebratory than anticipated, and at the end of the bacchanalian-like "negotiations" it was eventually decided four new variants would be built: one each for the Federated Suns, Capellan, Free Worlds League and Lyran militaries, and using technology unique to each realm. Some examples of these new 'Mechs achieved their baptism of fire during the FedCom Civil War. [Source: sarna]
You can download the papercraft model here: Classic BattleTech - Warhammer Free Mech Paper Model Download