I use this method of flip and turn when doing small lap top covers and playmats for children. I stitch in the ditch quilt when I use this method. I wait until I have all the quilting done before I finish up the turn out opening. I usually baste the opening closed then topstitch with my machine all 4 sides.
I quick baste the layers together and check for possible bubbles before beginning the machine sid quilting..Fo me this is quicker than putting on binding and stitching around the quilt again.