Ahh right - yup - would be interested to see the results then
I have seen them (quar's) in the flesh. Objectively it is a small difference, but it does alter the overall look quite a bit. The cobber sands down the edge of the sole around the forepart, avoids sanding the beveled waist, and then if needed repeats the process around the heel. The freshly resanded bits are then recoloured. For a similar result - just look at any Lobb City, where the edge is trimmed really close to the upper. IMO the larger welt 'lip' is part of what makes Vass shoes look a little more rustic, and perhaps a little less elegant.
the prominence of the welt has nothing to do with the thickness of the sole...
I believe they go hand in hand, but don't necessarily have to. On my last pair of MTO EG's I had them do a 1.5 thickness sole. The welt stuck out noticeably more than previous shoes which wasn't something I asked for, but ended up liking.