Dunno what you've been hearing Bruce.
It's exactly as Andrew says.
The only wrinkle I can think of is about connections between the body and the lens for auto anything. You don't need any of them . With a PB-6 you can use a double cable release and get an auto diaphragm, but I don't bother.
I believe Oly bellows are Auto diaphragm, but only with an Oly camera.
There are Chinese equivalents of all of Andrew's list, even the bellows.
Item 2 , a tube, you can use your Kenko, if you need it.
If you're unsure, start with 4 and 5 and the tubes you have, so the 60 will be backwards on the front. The object will be in focus where the sensor would have been, so the so working distance is short, but reasonable.
On ebay you'll find
4) nikon to 52mm reverse macro adapter for under US$20
5) for about US$10
6) be a bit patient, around US$50. I'd send you one but the postage from the UK...!
If you have something like a short zoom at 20mm, reverse that on the front and you'll have higher magnifications. They aren't going to perform magnificently in that mode, but if you want a pic of a bee's knee, you can.
These are US$50 on ebay
http://img.auctiva.com/imgdata/1/0/7/2/ ... 8897_o.jpg
but they don't have a focussing rack so would need extra support.
This is a PB-4, which DOES have the rail, decent price too at about US$200
The focus rail has the "foot" here positioned at the back end. It racks along the lower two bars. So if you mount on that foot, you can move the whole camera/bellows/lens assembly to and fro, focussing without changing the magnification, which is set by the bellows extension.
http://www.tg004b3325.pwp.blueyonder.co ... llows2.jpg
I'd buy that if I were you, better hurry cos I'm tempted myself!
(There's a PB-6 at US$800, ouch!)
There currently aren't any Chinese bellows listed with a rail.
You might see BPM bellows from time to time, for which a rail is available s/h.