rauchman said:
More out of curiosity than anything else, is there some kind of structural difference between a Modern and say Vintage/Modern that would force this?
Yep, mainly the thickness of the fretboard. On Modern necks it is thicker allowing for binding and scallops.
Problem with a Floyd nut on a Vintage/Modern neck has to do with how the truss rod approaches the nut area. On necks with a traditional single truss rod, the rod is arced when "at rest", and is angling upwards toward the fretboard at each end. That combined with the dimensions of our V/M and Vintage necks makes putting a Floyd nut there problematic. I know other manufacturers do it (Fender, et al), but it necessitates a lot of wood being removed at the nut area, so we choose not to do that.