The B-wing starfighter first made its appearance in the Battle of Endor scene in Star Wars Episode 6, Return of the Jedi. StarWars.com describes the B-wing as "perhaps the oddest-looking starfighter in the Rebel Alliance". The template for this papercraft B-wing by Czech designer Goozi is available here (Pepakura PDO format only).
Other papercraft by Goozi:
Grand Marshall Aegis