I got my backings cut...but...
My table saw fence has a broken securing latch that allows the top of the fence to rock away from parallel to the blade, so it was a frightful and dodgy ordeal to get them done. The technique I used to was to feed it halfway through, lift it up carefully, then flip and feed the other half. I still have all my fingers, but a new Delta T30 fence and rails is on the way.
The backings currently are both 1/4". I watched some youtube vids and found some ways to do it safer using jigs next time when the new rail comes in. I'll take them down to 1/8" then plane and sand them flat by hand.
Overall I'm still really excited about this bow. I think the handle billet will be hickory as well.