Hopefully you don't mind me adding my experience today. Didn't use anything except the saturn vue column and a 77 280z column. I figured a few more pictures of different setups in the thread is always helpful.
I cut down the saturn telescoping joint so it would fully collapse and removed the thicker bottom portion of the female portion as well as turning it down about 1mm so it could pass through the datsun bearing at the firewall. Making it collapse fully let me just expand it to whatever length I needed without worrying about measuring the section behind the power steering motor.
Then I could weld the original u-joint to the saturn telescoping joint, and pass the whole thing through the original firewall mount after grinding down the welds.
Because the power steering motor was free in the rear, it wasn't as solid as I would like. Particularly the steering wheel could have tilted up because it was only held in with the two mounting screws under the dash. So I added an extra brace that seemed to stiffen it up nicely. Washers are a little sloppy I know, but it works and lets me adjust tension.
All back together, doesn't stick out too much. I did remove the control box and bolted it to a thick aluminum plate as a heatsink under the dash.
Seems to work just fine, haven't had a chance to drive it, I'll update tomorrow.