I had good results with maple trim boards, {2"x1" which is 1 3/4" x 3/4"}
I made some 66" piramid, and straight limbs tapering the last 15" , a Holmegard, 70" all in the 50# range at 28",and a few kid bows 48" with these boards.The kid bows ranged from 36# at 24" to 20#@24".
I tried using Maple Veneer as a backing on some, but the "veneer" failed.The bow underneath was fine, so I removed the backing and cleaned up the glue mess.
For the kid bows I rip the board on the band saw , and glue on a handle,and cut out a shelf. They are all piramid style and have turned out great.It only takes about an hour and half to make a kid bow like this.I get 2 kid bows per board this way too.
Trim boards sell for about $1.50 a linear foot, making these very cheap to make and practice tillering on.
Pete