Thanks for all your motivating comments guys!
@ihbuilder: I´d certainly love to be a machinist but unfortunately I only do office work for a living.
@egronvold: Agreed. And for just one model (or two as in my case) the making of the tools and jigs is often much more than half the job...
I just shot two more pics, since I realized you might also be interested in the "internals" of the spindle with king pins:
The screw is an M2x16 mm. The king pins have diameter 7 mm.
Stefan