This spaceship paper model is the Serenity, a Firefly-class transport ship, a series of Multipurpose, Mid-Bulk Transport boats designed by Allied Spacecraft Corporation, based on the TV series Firefly, it was also a ship seen on the planet Coruscant's airways shortly after the declaration of the Galactic Empire in Star Wars series. The paper model was created by Planet StarFreak. There is another version of the papercraft here: Firefly – Serenity Spaceship Free Paper Model .
The hulls and engines are constructed at ASC's shipyard at New Burbank, Osiris, with final outfitting being outsourced to a dozen smaller companies, including the newly formed Firefly Ship Works on Hera.
All Fireflys feature a large rear engine module, wing-mounted engines capable of vertical takeoff and landing (VTOL), a centralized cargo section, and raised forward section holding the crew quarters and bridge.
You can download the paper craft model here: Firefly - Firefly-class Transport Spaceship Serenity Ver.2 Free Paper Model Download