Stradibarrius,
I do a lot of two sided carving on mandolin plates and necks… my experience is that you must have a way to index the piece. For example I build the mandolin top/back in Fusion 360 with index holes in the edge of the stock (clear of the actual part) for .25" wooden dowels that go down into the spoil board. When I turn the board over, the pins fit into the same holes and the machine knows “exactly” where the piece is located… If done right, there is no need to re-zero the machine unless you change bits or move your z-axis reference for the next carve. I will zero the x and y position when I turn the machine on and not change it again during a two sided carve because I design in these index holes that allow me to turn the piece over and use the same zero point. I hope this make sense… on a violin neck, I would put an index hole at each end of your stock. Let me know if I have confused you… I will take some pictures to help explain if necessary. Good Luck.
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