Anton. . .

I love the design and the fact you are going to make this already great jet even better. I agree with Dave re; the vertical fin/rudder. From the CAD, it looks like both can be enlarged. . .BUT keep the sweep for stability. My suggestion would be to make the stabilizer/elevator and vertical fin/rudder exactly the same size. Benefit would be one mold for production as well as part exchange availability. There are aircraft manufacturers today who use this very concept. Another benefit would be aerodynamic balance due to exact airfoils of both.

I look forward to getting my hands on one of these. Keep us informed of your progress.

Best regards,
Eric