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@jdmitch
The problem with doing it based on ERD (spoking diameter) is that you may not be drilling from that point. Not sure how these rims are constructed (ie the cross-section), but lots of rims would be a bit further out where you would be drilling from. Using another rim allows you to do everything effectively in degrees, a relative measurement, rather than mm, an absolute measurement. While I can imagine that in this particular instance, the methodology may fall short, I think the general principle of doing this by relative measurements rather than absolute ones are likely to be more accurate. I think this operation likely to have very fine tolerances (more so than spoking, where a few mm of play is permitted), and given the number of rims you are doing, it is worth setting up a jig of some sort...