I have a poly thin skin but my method is:
Position everything so front, sides, back matches and no gaps. My system is poly so it has that silicone sticky surface so it holds on it's own weight. I then flip up the front, and place the alice band just behind just in case! mark the hairline edge, and then apply the glue and let dry etc, and then secure the front.
Because I have already lined up the back I remove the alice band flip up the entire back so it is actually almost hanging over the front, apply glue let dry etc. Gently stretch and roll back. Perfect placement! I imagine you could modify this with a lace system! But you would have to use the alice band so it doesn't shift at all and then remove it once you ready to do the back.