Neal Hoover designed and built his own rock rails for his 1996 Jeep XJ.
He wheels pretty hard and in his own words: "They sure take an honest beating." (Neal, Thanks for letting Mesa 4x4 fearture your work.)
Test Fit
I started with 2x6x3/16" box tubing for the rails. I used 2x2x 1/4" tubing for the arms to the frame. And I used 10 gauge sheet metal to wrap the frame where the arms attached.
Rail Up Tight Against the Pinch Seam
I first drilled holes in the pinch seam, then butted the tubing up against the seam and marked through the holes onto the tubing. Then i drilled and tapped holes in the tubing for the pinch seam bolts.
Front Arm Bracket
Since the frame couldn't be completely wrapped due to the frame design, I utilized the bolts for the factory crossmember to help support the bracket.
Rhino Lining Done
I only did the portion of the rail that sticks out for stepping security. If I did the whole rail, then the bolt holes in the pinch seam would NOT line up due to the thickness of the Rhino Lining.
Finished Pic #3
Notice how the XJ's body is narrower near the front than it is in the rear. (The 2x6 tubing is completely flush against the pinch seam.)