I will mod my Marshall 1960 cab like this, which is loaded with G12T-75s. But I use Eminence Governors instead of V30s. The Governor is the 'v30 equivalent' from Eminence, just cheaper and said to be a little less 'harsh'/aggressive.
Next week I'll be able to tell more.
On a sidenote: the speakers are just one part of the equation. You can have the same speakers/speaker-combinations in different cabs and they will all sound differently, based on cab construction.
Greetz,
kickapoo