Free: Contests & Raffles.
The Traditional Bowyer's Bible is a good place to start. There are several volumes, and I believe they are available at amazon.com.
I have seen on this thread several times "if the school will let him".Why wouldn't they let him? I can see then not allowing him to string it or shoot it at school....(duh)...... but to deny it as a project? If the couselor said no I'd be scheduling a meeting with the principal and if I didn't get any satifaction then I would schedule a meeting with the Superintendent and bring a lawyer.I work in the school system and this kind of thing really gets me going. As a teacher there would be TONS of teachable moments in this project. The science and math applications would be almost limitless. Good luck and good hunting!!
My personal experience with the Traditional Bowyer's Bible is that it is too broad and might confuse or otherwise intimidate a first time bow maker. It has a ton of information that is useful, no doubt.