Jarod, As I understand it the plains indian bows had a gull-wing profile when strung. I suppose you could call that a 3 curve. I've never seen referrence to an original bow that had recurved tips, or to stiff tips. So I guess what I'm quibbling with is your terminology. The bow you picture is still sweet, no matter what you want to call it.
First....The reflex in the handle can be obtained by using a reflexed stave, by bending with heat or by starting with billets and simply gluing the reflex in. The deflexed portion of the limbs can be heat bent, or if you are making a sinew backed bow you can just leave the limbs straight and the gull wing shape will develop as you string the bow.
Adding recurves would normally be done with heat Stiff tips are just a matter of leaving the tips thick enough to not bend. None of these procedures are difficult, but they do take some planning. A little practice doesn't hurt either. Ron