Al, that's wrong. Your information pre-dates the Tacoma-era. Here's a picture of the inside of my Tacoma F-512.Adi was first used for tops in Tacoma on the D40 an D50 "Bluegrass" models as well as the F40 "Valencia" and the CV-2 and CO-2.
https://www.gad.net/Blog/2010/08/23/guild-guitar-catalog-2006/
Yes, the same one in Oxnard now was used from mid -'80's Westerly through New Hartford.
No scalloped bracing on jumbos, besides, the whole point with adi (in Tacoma and later) is that it's strong enough to be able to make bracing of lighter weight but equal strength to sitka. No need to scallop for jumbos.
"Our jumbo guitars never have scalloped bracing because of the breadth of the top".
(Assuming that's accurate, given they showed scalloped bracing on first-year JF30-12's, for example.)
But that comment was concurrent with a change on the spec sheet from "Shaved" to "Jumbo X", so I give it high credibility, besides its accurate premise:
Like I said, this is Tacoma or later, not Westerly. I know for sure that in New Hartford, the braces were rough cut by a computerized mill, and they cranked these things out when they needed them.
