Your scheme looks very similar to mine. Very clean work, man!
As far as textures go, I have painted much of my army using hand-brushing (I'm almost done with my Super Tuna all done by hand) and once you varnish most of the paint's texture will go away, the varnish might leave a very slight texture of its own though.
My problem with airbrushing is two-fold, I think the regulator I am using might be garbage (it came with the compressor) and I can't seem to get the right consistency when mixing my own paints from the pot. The Citadel Air paints are nice and fix this one problem, but it's difficult to source, only one store in my area carries it and they run out and then take months to restock. If I know of a Vallejo color that was matched to Tau Light Ochre I would probably use that. Would save me a lot of time, too.