multiple spindle z axis design

looking for multiple spindle with optional independant z axis design,
I have herd of a few , but would like to see what out there before
start designing mine.


simple example ganged design... Rotuer 4 Heads One machine.
.
[nomedia="http://www.youtube.com/watch?v=48B1Zs7pOOI"]YouTube- K2 CNC Rotuer 4 Heads One machine.[/nomedia]

[nomedia="http://www.youtube.com/watch?v=wB-cpoR7WwU&feature=related"]YouTube- CNC mach artcam[/nomedia]

[nomedia="http://www.youtube.com/watch?v=HcIZZqJzQ4E&feature=related"]YouTube- CNC carving, machining wood[/nomedia]



looking for diy or commerical Inspiration

please post a link if you know of any other designs