Hard to say what the advantage is as I don't do it the other way over. The Spanish tradition to which I subscribe does it this way. My peone construction method could not work back down. Since the sides are perpendicular to the top, and not to the back, it seem logical to me to work off the top. I do not charge for my body wedge as it is quite easy to put the back on at a jaunty angle. Not so true if it has to be done before the box is otherwise assembled, or so I imagine. On the other hand, bevels might be easier back down for similar reasons. I will probably never do a bevel though, as I believe they are incompatible with my traditional/vintage guitar construction concept.
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