I got this off the net, but it sounds right. Stab area is 20-22 of wing area. Aspect ratio of 3:1. Elevator is 20% of stab. Fin is 1/3 of the stab area. Rudder is 1/3 to 1/2 of fin area. I think that is light. I also saw that you can use 7% of wing area with 35% of that for the rudder.

Use this with a grain of salt. it is just info I got from the net. You can always go slightly bigger. I would, especially with a bipe. With the close coupled wings I would definately enlarge the stab and elevator some. Good luck with this project.

Mark Shuman