With the right alloy wheel, why not machine the center and press in bearing races?
Crappy MS Paint picture of my idea: ('Wheels' to the left)
As I was thinking about making a floating axle hub for a project I'm developing, I got to thinking, "Why bother with a hub?"
Besides, the obvious benefit of speedier tire changes; why not do away with it? Why not make the wheel, hub, and rotor hat one piece? There's several pounds of sprung weight and rotational mass shed right there.