Raw hide doesn't offer any appreciable tension strength more for holding down splinters on violated backs I use very thin goat raw hide it adds very little mass ,I don't know iron wood but if I where going to make a flip tipped bendy at my draw 29 1/2 osage ,I usually tiller to 47 lb I would start at 62 in. it's a good size for blind hunting and would give a margin of safety but The shortest non sinew bendy I made at my draw is a 65 in. osage ,last year I hunted from the blind with a 62 in. Hickory/sinew bow this year I'm using a 68 in osage self bow I just found a little higher stool , a 62 in bow would still make a nice Turkey bow, but all this is just my 2 cents.