Thats a bit of a misnomer...the only custom shop is in Nashville, while the 335s are all made here in memphis...your special order (custom) would be assembled in memphis and all appropriate hardware would come from nashville if not in stock in the memphis facility...
he's right-- the solid bodies are Nashville, the hollow and semi hollow are Memphis. If you should ever take the Memphis Gibson factory tour, do it before 2 pm. Many of the luthiers have left for the day by then. (They start early)
Yes. The shop in Memphis is under Custom Shop management and is considered part of the Custom Shop. They make all the ES models except for the Historic Reissue models which are made in Nashville. In other words, Gibson doesn't make regular production ES models anymore.
And prior to '06 or '07, the Custom Shop ES's were made in the Nashville Custom Shop (and say so on the orange sticker in the f cavity) along with the other Historics. Alas, no more.
Well all I know is that my "fatneck" 335 - which I believe is not a CS 335 - is a better guitar than my Historic was! And I don't know where it was made! I suspect it was Tennessee...