Dan, my reply is more of an FYI as well. Deepgroove is doing something like this, if not the same thing with the g540. I have one of his boxes with a 5 axis g540 setup.
Goes to show that sometimes people think the same way. Good job on the 5 axis.
Now a word of advise for your customer. For jewelry work, the taig is going to need to be well lubricated. Keep the gibs on the loose side and dont run it very fast.