I had cut some oregon ash back in august, and steelslinger just got it his first bow finished out of it. It dryed surprisingly fast without twist or checking, and proved to be a very good bow wood. I know all the arguments for board bows, but they just don't do it for me, and I wouldn't want to start someone on a lumberyard piece. If you can get more yew, you could trade some of what you have for seasoned staves. I think you should still take them out to cut there own staves, but find a source of seasoned staves to get them started now.