Here's the back joined and cut out (I used a band saw for this one).
Here are the two plates getting to know each other.
As you can see, our tiny second 1/2 bathroom makes a great place for guitar pieces to be stored while the glue dries. My plates were surprisingly wobbly (especially the rosewood) at this stage, so I handled them carefully and even clamped one to a straight board along the seam when not in use--they'll firm up as the waste is trimmed off, etc. (that glue joint is surprisingly strong).