31 kilo airplane

Here are some preliminary sketches for a 31 kilogram (dry weight) aircraft
The specs are:
Radne Raket 120 engine, 14 hp
6 m wingspan, 0.7 m chord, 4.2 m2 wing area, NACA 4415, 3 deg dihedral
3 axis with full span flaperons 
Gross takeoff weight 120 kilos
Stall speed 65 km/h
Cruise 110 km/h
VNE 130 km/h

Weight breakdown:
Engine, prop and exhaust 11 kg
Fuselage with controls, tailplanes and undercarriage 10 kg
Wings with struts 10 kg

Construction is foam & composite with unidirectional carbon fiber at key locations.