Not bad looking wood and it might be strong enough if laminated into an I-Beam, but I think poplar might be a little on the light weight side for a riser. I like something heavy which helps eliminate handshock. If it were me, I'd give Kenny a call and have him send the chunk of zebrawood. With his service, you'll have it in a couple days. You originally wanted zebrawood, so I think you'll be glad you waited on it.