If the airplane is straight and balanced correctly, there is no need for anything more than 30 to 35 degrees, and most of that would never get used, but may help you psychologically. Search out threads on the Magician and I think you will find about a 50-50 consensus on whether to install flaps on it airplane or not. Leaving them off will simplify construction and flight trimming. I have an example of each version of the kit and if I ever get around to building one, I will leave them off. For the average "Joe Bellcrank" it will fly very well for them without flaps. If I would change anything, I would make the stab/elevators thicker, just because 1/8" looks too darn flimsy!!
Type at you later,
Dan McEntee
( Fixed it!)