Part of the confusion might be also that the the GSR X-500D Stuart and the GSR X-150D Savoy were the first New Hartford made guitars using the new BH (Korea) made "Guild Anti-Hum Dual Coil" full size HB-1s back in 2013.
As far as I know only the GSR Bluesbird bodies came from Korea at a time when SPG in Korea already shipped various Newark St. models.
The GSR X-150D bodies (and others) were from an old Donnie Wade project from Tacoma times before 2006.
Frono had said in the past that during one LMG tour somebody in NH said that at some point the white wood was stored at the Guild Nashville custom shop, which would have been before Guild Tacoma. Frono got no clear statement concerning whether those whitewood bodies were made in Corona, Tacoma or even Nashville. Frono's personal opinion was that they had nothing to do with Tacoma unless it was as a storage location and that they were assembled, including the neck, in Corona, Nashville or both.
Cazmo however, who had very close relationship to the NH guys once said he believes these bodies actually originated in the Far East, which is what he thought the Fender folks didn't want made public. He thought a number of people had heard this over time, but he asked to not necessarily trust what he was saying...
My personal opinion is: Since Fender as Guild owner at that time already used several Asian factories for their various guitar brands it is likely that they commissioned one of them to build several different styles of vintage style Guild bodies and maybe due to the several fast moves of factories from Westerly to Corona to Tacoma and to New Hartford they never really started the projects until the team in New Hartford decided to use those old bodies for good on the extremely low volume GSR projects.
The following picture is from a former Canadian Guild dealer factory tour in NH from April 2012. Most probably those were some of the racks in New Hartford when those whitewood guitars came out of storage.
It showed no X-150D but the following:
Left side from back to Front:
1: GSR Starfire Bass (Mahogany body)
2: GSR X-180 Archtop with Chesterfield headstock logo
3: GSR M-85 II bass (Mahogany body)
4: GSR Starfire Bass (Mahogany body)
5: GSR X-180 Archtop (like number 2)
Right side from back to front:
6: GSR T-500 (2 inch wide body)
7: GSR T-400 with Chesterfield headstock inlay
8: GSR X-180 Archtop (like number 2 and 5)
9: GSR X-500D
10: GSR X-500D, same like 9
Ralf