I think veg tan leather would be best for what you're doing, 5 min epoxy inside the beak, cut the beak to shape, so when you fold it's in the shape you want, then stitch under or mold it on a form, Ie, a piece of wood. Then paint the inside after it's dry with 5-minute epoxy , then paint the outside with Acrylic paint, as Chuck said, good luck and have fun!