Well if the V4b is wider than his cab must be smaller cause I'd say that there is a couple of inches left on either side of my head left of cabinet.
Was looking to see if they had dimension listed but they don't appear to.
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The V4 is wider than the SVT. I had a V4 and the SVT at the same time. I dont know if the fliptops 4x10 is specifically made for the SVT and the 1x15 is made for the V4 or not. I do know that they built mine for the SVT and added cups for the head to sit on. Since the build time is 4-5 weeks, I am sure they build to match the head you are using.