I'm still working on PCB milling.
I'm thinking about 3D 3-axis CNC milling with Skeinforge.
5 axis CNC milling is out of my leaguge.
However....with such a rig I could do manual 5-axis milling by copying a master that I "simply" 3d printed.
This could be the way for me to design and test complex prototypes in ABS on the 3d-printer and later copy them to metals or wood.