Glue two halves of soundboard togetherWhile my shop is full of power tools and jigs, this step is about as low-tech (and effective) as you can get. The soundboard halves get glue on the jointed edges and they are aligned on top of four sticks. Twine is criss-crossed across the soundboard and wedges are slid under the twine. The wedges draw the two halves together and assures that the joint stays perfectly flat.
The same method is used for the back.