I have seen infernored's slider/rocker set up in person, and it is a solid looking and feeling piece. I plan on doing the same thing as he has done. He warned me to beware of the foam that is behind the rockers, it can flame up when cutting the old metal out. That's the best I can give you for what I know is behind them.
99' WJ, 2.5" Rusty's, Bilstein 5100's, JKS TrackBar, Moog SuperTrailBoss
"With enough fabbing, time & $, it's certainly possible.
That being said, it's like boinkin' your sister...just because you can, doesn't mean you should." - Double E