Its really nice to see your work, it does indeed represent the non-skeu way of going, but .. you lost me at knob.
I mean, it is a bit of a cop-out, and you can't go "skeu is the sux" and then .. just use it.
My question to you, then, is: how would you re-do the knob? It is a uniquely viable control; but lets say you -had- to get rid of it. What, then?