RCKen,

The plane has the same dihedral than we put on Trainer 26 and Trainer 50 and it is prove to be enough. I design, build and test fly all these trainers and believe me, they are very stable. I use my Trainer 50 for two year now with over 100 flights and it is one of the most stable plane i ever flew even in heavy winds. You can hear the wind in some video of my T50 i put in youtube and the plane is very smooth to land even in that wing. So i would say build it as design and you wont get any problem.

http://www.youtube.com/watch?v=7EvunVulv1s