This mech paper model is Mektek Jenner IIC, first fielded in September 2784, the same year the Exodus fleet that would eventually become the Clans left the Inner Sphere in November, from the video game MechWarrior 4, the papercraft is created by BLaaR and Cantaris. The size of finished model is about 185 (H) x 147 (W) x 131 (D) mm.
How exactly they acquired this design in that short timeframe is not known, but what is known is that the Clan version fields Clan weaponry, so it is known as the Jenner IIC. This second-line BattleMech is still a fast light that is now capable of delivering plenty of short-range missiles. To achieve this, it uses an XL Engine, Endo Steel structure, and mounts only three and a half tons of Ferro-Fibrous armor. It also carries enough jump jets to leap up to 210 meters at a time. This results in an expensive garrison 'Mech, but one that is still in production nonetheless.
Unique among the IIC models, the Jenner IIC changes the leg mechanism found on the original design. While the original Jenner, despite otherwise sharing design characteristics common in Marauder-descended reverse articulated 'Mechs, had standard forward articulated legs, the IIC model has reverse articulated legs similar to those on the Stormcrow. [Source: sarna]
You can download the papercraft model here: MechWarrior 4 - Mektek Jenner IIC Free Mech Paper Model Download