all wood laminate or glass?
I just messed up a 58" all wood hybrid by making the maple core too thick (the 1/16" still was too thick). Had to sand all 90% of the ipé belly away, and the boo started to overpower the maple core, that had become mostly a belly.
but on longer bows, like 64"+ I'm sure you can get away with a thicker core than 1/16". Purpleheart could look cool, though it's likely to darken pretty quickly, unless you cover it with an uv laquer...
boo is an excelent backing, osage is an excelent belly, and purpleheart will give a nice core.
what design are you aiming for? elb, afb, r/d?
tell me!
project sounds good, goodluck!
Nick