I rarely start building a bow knowing what it will be. I let the wood direct me. There are design aspects I use that are the same like bulbous handles and rigid tips, straight, reflexed and recurved but it depends of the stave I've chosen, wood type and length...and character or straight and clean. Do I make a pyramid limb shape, semi-pyramid and to what degree. It all depends on the chosen stave for me. If a stave doesn't talk to me I set it aside and pick another. I'm fortunate enough to have a variety of seasoned staves o work with.
I do purposely build a bow like my recent hickory backed lemonwood ALB but not that often. I did enjoy the process and the results but for me, I'd rather find the individual bow inside the individual stave.