Abunai,
There is so much to this build you'll really have to go back thru the original 3-axis thread:
http://halloweenforum.com/showthread...t=Halloweenbob and go thru each post. I know it's a lot to take in but it's the only way to get a feel for the build.
As for the swivel, the first one is HalloweenBob's design, the second is mine.