DanH's method looks very good especially if you are doing all by yourself. The hand hold you can see in DanH's upper picture is not overkill or having friend helping you.
Tip to the beginners: I would start from rudder as it is thinner material and therefore easier to bent. You'll learn during it and you'll need that when working with thicker elevator skins. Having bigger pipe (than with elevator) with rudder is good as well.
You will not make correct bending anyway for first time, but try make sure that you don't bent too much skin which comes bellow and minor over bending of topmost skin is better than not bending it enough.

It's hard to change radius after it's once done as said earlier.
And finally to answer original question: there is no waving (inside or outside) and skins are sitting against each other where they overlap -- can you do more?