The Twin was designed as a trainer for the Air Creation Fun Racer. It complies with the Fédération Aéronautique Internationale microlight category, including the category's maximum gross weight of 4500NaN0. The aircraft has a maximum gross weight of 3850NaN0. It features a cable-braced hang glider-style high-wing, weight-shift controls, a two-seats-in-tandem open cockpit without a cockpit fairing, tricycle landing gear with wheel pants and a single engine in pusher configuration.
The aircraft is made from bolted-together aluminium tubing, with its Air Creation Fun 450 single surface wing covered in Trilam Dacron sailcloth, with a Mylar leading edge. The 10.061NaN1 span wing is supported by a single tube-type kingpost, uses an "A" frame weight-shift control bar and has a wing area of 17.4m2. The powerplant is a twin cylinder, air-cooled, two-stroke, dual-ignition 500NaN0 Rotax 503 engine. The aircraft has an empty weight of 1290NaN0 and a gross weight of 3850NaN0, giving a useful load of 2560NaN0. With full fuel of the payload is 2290NaN0.
The manufacturer estimates the construction time from the supplied kit as 40 hours.