For sure - but I doubt that Volvo's the only way to go; I'd suggest to anyone embarking on such a project to scope out their local yards (if such a thing's allowed any more - I know my local one don't allow people to just wander in to see what they have) as there are probably all sorts of things that might be suitable.
(I wonder how suitable a second bearing assembly, mounted vertically, would be for providing the swivel functionality, given that they're designed to operate with the weight of a car on them? It'd be relatively easy to pull both bearing assemblies from a junk car, anyway)
Have a URL handy? If not, I'll take a look around... sounds interesting.
It certainly seemed a bit 'odd' given the kind of shape I'd expect for a [wind] turbine blade.
Thankfully I have a barn here that's about 40' to the roof-line, so I'd "just" mount any turbine that I tried to build up there, I think; it wouldn't need much of a pole beyond what was necessary for the blades to clear the ridge. For others though, yes I can appreciate that the supporting structure is a major part of the problem.
cheers
Jules