Nealla, just so you know... 10 years ago, back in New Hartford, we had very good access to the Guild shop and we got lots of our questions answered from the Guild staff and management. We also had a direct line into Fender (Guild's parent at the time) where we might've been able to get an answer to a question like yours. In fact, we got some very solid insight into what was being done to the 100-series modifications (née GAD series) at the time from the guy who was in charge of that.
Unfortunately, we don't have that communication going on anymore. Maybe we'll see it in the future as Yamaha takes the reins of Córdoba Music Group. We'll see. At this moment, we can't give you any solid answers about what's going on with the Asian-built acoustics (Westerly series, that is).
In any case, I'm pretty sure any answer you get to your question here, Nealla, is conjecture. I think the metric system is very likely the cause in this case, but again conjecture. Your soundhole is probably 100mm.