That Comstock flatbow is as close to an all-around design as you can get, but I'm like Nick-I only take the full width to mid-limb and then start tapering to the nocks instead of carrying the width out near the limb tips. As Pat said, though, each species of wood has different weights and bending characteristics (or even different pieces of wood of the same species). So you can take the basic design and adjust it for the wood you're using. Hickory, ash, birch, walnut,and such usually work well at about 1 3/4"- 2" wide fades to midlimb. Locust, mulberry dogwood, persimmon, and others can be 1 1/2"-1 5/8". Osage or tropical woods can be narrower.