I would highly recommend you get the "How to Construct the Asiatic Compsite Bow" DVD, but Jffrey Schmidt and John McPherson. It is a great video. I also have the 2-volume "The Way of the Bow" video on making a Korean bow. I found it very tedious, but still some great information in there, but you have to sit though 4 hours of video.
I dont have it yet, but a new book came out by Adam Karpowicz on the Turkish bow, that may help too.
Dane