Fancy brushwork like this is fun i know, but almost never practical, both from a looks and resources perspective, i.e. you are much better off using a very simplifed brush with a nice texture, to achieve the same or similar look.
It sucks that gs doesn't have displacements nor smoothing groups...
I was playing around using the lathe method, and i was able to do this in like 30 seconds:
(i know it's not exact look you want, but it gives you an idea of what you can do lathing)
As far as the texturing, that's the best i can do.. i feel like the texturing in source is way easier somehow...