(It's getting harder and harder to come up with snappy titles!)
Ta dah! I got all the trimming and underneath taping done on the rose window as well as almost used up the fourth package of bias tape.
So I've started sewing down the bias radially. When all that is sewn, then I get to put the bias down in 7 circles from the center out. But I'm so happy that the pieces are not flying around anymore.