This papercraft is a Sovereign, the flagship of the rogue Spectre Saren Arterius, based on the Mass Effect video game series, the paper model is created by MademoiselleRed. The size of finished model is about 500 (H) x 211 (W) x 179 (D) mm.
An enormous dreadnought larger than any other ship in any known fleet, Sovereign is crewed with both geth and krogan. At two kilometers long, its spinal-mounted main gun is likely capable of penetrating another dreadnought's kinetic barriers with a single shot.
The prevailing opinion is that Sovereign is a geth construct, while others believe it is a Prothean relic. Its design, however, hints at a more alien and mysterious origin. The attack on Eden Prime demonstrated Sovereign's ability to generate mass effect fields powerful enough to land on a planetary surface. This implies it has a massive element zero core, and the ability to generate staggering amounts of power. [Source: wikia]