Clamping.  A critical function for making solid and lasting glue joints, it can be accomplished elegantly by the use of a rigid frame and go-bars.  For many lute designs all the barring can be glued on in a single pass by this approach.  Note that the photo shows a dry mock-up to demonstrate the technique for the class – normally the soundboard would be cut to shape and planed to thickness, the rose would be cut out, and the bars would be profiled before gluing them on.