This airplane paper model is an Airbus A300-600 (Prototype), created by Bruno VanHecke. There are 1:100, 1:144 and 1:300 three scale versions. There is also an Airbus A300-600ST Beluga Paper Model on the site.
Officially designated A300B4-600, this version is nearly the same length as the B2 and B4 but has increased space because it uses the A310 rear fuselage and tail. It has higher power CF6-80 or Pratt & Whitney PW4000 engines and uses the Honeywell 331-250 auxiliary power unit (APU).
The A300-600 entered service in 1983 with Saudi Arabian Airlines and a total of 313 A300-600s have been sold. The A300-600 also has a similar cockpit to the A310, eliminating the need for a flight engineer. The FAA issues a single type rating which allows operation of both the A310 and A300-600. [Source: wikipedia]
You can download this papercraft model here: Airbus A300-600 Free Airplane Paper Model Download [Box] [Gavitex]