I have been using Nikon lenses for 3 years on my Red
Here is what makes it works for me.
OptiTek Nikon mount optitek.org/nikon-prolock.php keeps the mount rigid. (mentioned several times on forum)
The front of the lens can still shift.
I use a clip on matte box with 3 rods around it to eliminate any up/down or sideways movement of the front of the lens.
Focus gears, I ordered mine from www.jbkcinequipt.com
A wireless focus system with rings for each lens that I made with a Putora focus chart.
This spreads out the marks to about 300 degrees on the ring and lets me set marks that are missing on the lens.
I have a Bartech and designed my rings with shapeways.com. For more info on my rings see http://www.steadicamforum.com/index.php?showtopic=13620
As I have a analog system I also painted end marks on the lens. If you have a digital system that auto calibrates this is not necessary.