I used a similar approach to the one Simon suggests (read it somewhere, but not sure where). A couple of small variations... I did not use guitar strings, I used actual strings pulled tight over the nut and through the peg head holes. I left the saddles in the bridge and just measured for the intonation. It seems to have worked.
The other thing I added to this process was a drilling jig.
This is useful for any place you need perpendicular holes, but you either don't have a drill press or it won't reach. This is especially difficult if there is an arch in the top.
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