Rick, most of mine finish up about 1 1/4 " wide at the handle and fade area. The tips start at 1/2 inch and when the,bow is,finished are less than 3/8.
The shape is a delayed taper from the fades to the tips.
Thickness, I start with about 5/8" for a 50 to 60 pound bow.
I do not taper,the bamboo backing. I do make it flat and thin before cutting to the template.
After cutting the shape further thinning will be required since the edges will be thicker now.
I like the edges to be close to 1/16" or even less.
One of the best sources on bamboo backed bows is Dean Torges his DVD is excellent.
I could send you a tracing of my template if it would help
Ron