This mech paper model is Penetrator, an OmniMech from the game Classic BattleTech, the papercraft is created by BLaaR and Madcatmaniac. The size of finished model is about 239 (H) x 255 (W) x 168 (D) mm.
The designers at Kallon Industries used the Black Hawk Clan OmniMech as the basis for the Penetrator. The Penetrator has an all energy weapons arsenal and uses twelve double heat sinks to handle the massive heat load from its weapons. The 'Mech is lacking in speed though when compared to the Black Hawk. This is because the 'Mechs designers used a Vlar 300 fusion engine for its combat durability, giving the 'Mech a top speed of 64.8 kph. To help offset the 'Mech's lack of mobility, the Penetrator has four Anderson 398 jump jets giving it added mobility with a jumping distance of one hundred and twenty meters. The Penetrator also carries a respectable thirteen tons of armor. The 'Mech's heavy armor protection, combined with its standard engine and near-non reliance on and limited amounts of ammunition, make for a 'Mech that is very rugged and hard to kill. The first Penetrators started coming off the production line in 3053. [Source: sarna]
You can download the papercraft model here: Classic BattleTech - Penetrator Free Mech Paper Model Download