I built this 25+ years ago. I always thought the 2 seat version was very unique.
The Avia CS-199 is a 2 seat trainer version of the Messerschmitt Bf 109G-based fighter aircraft built after World War II utilizing the Bf 109G airframe and a Junkers Jumo 211F engine in place of the original and unavailable Daimler-Benz DB 605 engine. Wikipedia