You could easily make an ELB with 7/16" thickness if you made a tri-lam, using 1/4" backing and core. The bow you're referring to (that I recently posted) was ash backed, yew core and ipe belly. Make it 70" to 76" long. Make it 1 1/8" to 1 1/4" wide at the grip and 1" total depth thickness at the handle, and with a 4" straight grip, taper continuously to 1/2" tips. Same with the belly... taper from 1" thick at the grip to 1/2" at the tips and you're ready to start tillering. Get the middle bending first so it doesn't end up whip tillered and then bring your tips around just at the end.