So far they haven't had enough women selfbow shooters to have an IBO world women's selfbow class, Julia said there had to be at least 13. Selfbow classes are pretty liberal as far as design, one piece of unbacked wood is pretty much it in any tournament up to the nationals, I don't know about the specific IBO rules.
Julia has won the nationals at Cloverdale 2 or 3 times with that bow, it met the criteria for their selfbow class. She has also won the IBO world women's longbow class twice with a modern longbow that her husband Danny made.