James, I had the same idea as you last year and I built a form for a kids r/d longbow and made a few bows on it. Here is my advice to you... Do not do a kids r/d bow instead do a more Howard Hill type of bow for kids. R/d bows are nice because they tend to have less hand shock but kids bows (15- 25#) should not have the problem of hand shock because of the light weight. My advice on building a form for the kids bow is also very simple get or make a form that is about 56" long and 2" wide and get a perfect straight cut on the board with a table saw. You will then have the perfect form for the backside of the HH type bow. This form will allow you to make any length bow up to 54" and for a bow in the lower poundage you will only need one or two lamination. Here is the best part you can buy 2" Black .030" glass for about $10 a piece and using 2" glass on a 2" form you can then cut the final glue up down the middle with the band saw and make 2, 1" wide bows at a time. Hope this helps and if you decide to go ahead with kids r/d bows I wish you the best of luck. I think every kid should have a bow and I love it when people make kids bows.