Using a bit of modern technology, paper templates of all the waterlines were created from the original lines drawing.
The "bread", in this case cedar, is thicknessed to the distance between the waterlines on the profile plan.
While marking the waterlines onto the timber, a few station lines are also transferred, allowing alignement while glueing up.
The "Butter" is, of course the glue. Extra care has to be taken to make sure the pieces are perfectly aligned and all down flat against the sash-clamps.
Drilling before glueing and then inserting one or two dowels can be helpful, but one must bear in mind that quite a lot of shaping will take place, so placement of the dowels has to be carefully considered.
Here you can see the glued up model. Now comes the fun bit of shaping it!