Goodie ,I've had to make quite a few composite roses for weddings , I use the method in the video with pretty good results! Remember to work in a well ventilated room because the glue is very strong. You can make these quite large by increasing the size of the cardboard backing. The only thing that bothers me about the finished look is it is flat when viewed from the side. The wire and tape method had a more 3d quality . I'm curious about the hair pin method and hope to hear more about that.
Anyway, good luck and again...caution about the ventilation...you can get pretty high!
Anne