Nice looking bow from what I can see.  Osage is called by many names, you're referring to Bois D'Arc, but it's also called bodark and hedge apple among other names.  Hope to see a full draw picture on your bow.  61" requires pretty good tillering for 28", you've done well.  I've never tried to make a sapling bow, but perhaps I need to be watching for a clear sapling (if such a thing exists).  Dealing with knots is the price we normally pay for using osage.  I love osage, suspect you will too.
George